Adafruit

US$8.67
This set comes with 3 different boards which fit 5 different packages and comes with five SOT-23 (fits 2 x SOT-23 on the back, and a single SOT-23-5 or SOT-23-6 on the front), four SOT-89 or SOT-223, and four TO-252.
Delivery within 2-3 weeks
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US$23.02
The FLORA is small (1.75" diameter, weighing 4.4 grams). The FLORA family also has the best stainless steel threads, sensors, GPS modules and chainable LED NeoPixels, perfect accessories for the FLORA main board. The FLORA has built-in USB support. Built in USB means you plug it in to program it, it just shows up - all you need is a Micro-B USB cable, no additional purchases are needed!
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US$17.42
This PCB fits neatly on top of a Beagle Bone, without getting in the way of the Ethernet jack, and provides a breakout to both 46 pin headers - with individual numbering to keep them straight.
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US$6.92
This is a 9V battery pack with on/off switch and a pre-attached 5.5mm/2.1mm barrel plug. Use this to battery-power your Arduino (or other electronic projects) - it's ready to go out of the box!
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US$5.25
These are high quality battery clips. They're molded plastic so they wont tear like cheap clips, and they cover the battery terminals to prevent shorts.
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US$7.00
This here is your standard A-B USB cable, for USB 1.1 or 2.0. Perfect for connecting a PC to your Arduino, USBtinyISP, or USB Boarduino (among other things).
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US$138.53
Included are plenty of parts to make a few different fun projects! There's a Flora motherboard, a GPS module that can also perform location datalogging, eight ultra-bright chainable RGB pixels, a battery holder and batteries, two types of our high quality stainless steel thread, alligator clips to help you test out your parts, a USB cable for reprogramming the Flora, and some parts to make a wearable remote control (or TV-B-Gone!): NPN transistors, long range IR LEDs, and matching resistors.
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US$19.17
Lithium ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 1200mAh for a total of about 4.5 Wh. If you need a larger battery, we also have a 2500mAh+ model (328-ADA). The batteries come pre-attached with a genuine 2-pin JST-PH connector as shown and include the necessary protection circuitry. Because they have a genuine JST connector, not a knock-off, the cable wont snag or get stuck in a matching JST jack, they click in and out smoothly.
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US$10.71
This thread is 3 ply, thicker than every day polyester or cotton thread but still thin enough to be sewn by hand in medium-eye needles. This may be sew-able by a sewing machine that can handle 'heavy' thread. Because it is strong and smooth, its ideal for any wearable/e-textile project.
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US$10.86
This thread is 2 ply, a little thicker than every day polyester or cotton thread but still thin enough to be sewn by hand in medium-eye needles or with a sewing machine that can handle 'heavy' thread. Because it is strong and smooth, its ideal for any wearable/e-textile project.
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US$6.09
The small 5mm size of these tin-plated brass snaps means they fit perfectly on Flora's pads! Snaps make a great connector for wearables-- solder one side to the board and sew the other to your project with conductive thread! This card comes with 24 complete snaps (socket and stud pairs).
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US$3.42
Fits any standard AAA battery. When using rechargeable NiMH the output voltage will range from about 3.7V with charged batteries to 2.7V at the end of life with a nominal voltage of 3.6V. When using alkalines, the output will range from 4.6V with new batteries to 3.3V at the end of life with a nominal voltage of about 4.5V
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US$3.01
These magnetic pin backs have two pieces: a metal bar with adhesive strip and a plastic piece with two strong rare-earth magnets. Affix the metal bar to your FLORA projects-- it's just the right size! Then attach your FLORA project to any garment without poking holes in your clothes.
Delivery within 2-3 weeks
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US$3.01
2 x #3 needles (0.04" x 1.75") (1mm x 45mm). 6 x #5 needles (0.0375" x 1.65") (0.95mm x 42mm). 8 x #7 needles (0.035" x 1.55") (0.9mm x 39mm). 4 x #9 needles (0.027" x 1.35") (0.7mm x 35mm).
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US$27.92
Lithium ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 2500mAh for a total of about 10 Wh. If you need a smaller battery, we also have a 1200mAh model (258-ADA).
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US$1.67
Red and black tinned wires with a 2-pin JST PH connector on the end. 4" / 100mm long. Matches up nicely with our Lipoly charger!
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US$22.74
This provides 16-bit precision at 860 samples/second over I2C. The chip can be configured as 4 single-ended input channels, or two differential channels.
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US$43.67
This pi plate is perfect for when you want to build a stand-alone project with its own user interface. The 4 directional buttons plus select button allows basic control without having to attach a bulky computer. The plate is designed for both Revision 1 and Revision 2 Raspberry Pi's. It uses the I2C (SDA/SCL) pins. We have a special xtra-tall 26-pin header so the plate sits above the USB and Ethernet jacks.
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US$53.68
This lovely little shield is the best way to add a small, colorful and bright display to any project. We took our popular 1.8" TFT breakout board and remixed it into an Arduino shield complete with microSD card slot and a 5-way joystick navigation switch (with a nice plastic knob)!
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US$3.42
These are standard 6-pin, 8-pin and 10-pin 0.1" spacing female headers...with a twist! The pins are extra long which means you can use these to stack shields!
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US$17.42
Measure liquid/water flow for your solar, computer cooling, or gardening project using this handy basic flow meter.
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US$38.50
Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening, aquarium, or pool project. There are two 1/2" (Nominal NPT) outlets.
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US$13.92

15 rows of double 5-hole rows + 48 individual holes. 2 power rails with positive/negative markings. 2.1" x 1.3" (54mm x 33mm), 0.063" thick FR4. 1.2mm / 0.047" drill holes. 4 x 0.125"/3mm drill mounting holes spaced on a 45.5mm x 25.4mm / 1.8" x 1" rectangle. 

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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 8-TSSOP/8-MSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 8-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard. 
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 12-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 12-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 14-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 14-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 28-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 28-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
Delivery within 2-3 weeks
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US$6.92
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 16-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 16-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard. 
Delivery within 2-3 weeks
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US$10.42
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 32-QFP pin out with traces going to two rows of 0.1" spaced holes, the other has 32-QFN. Solder your chip to either side and you're ready to rock on any solderless breadboard. 
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US$2.63
These 4-wire cables are 15cm long and come as a set, one side has a JST SM type connector plug on the end. The other side has a matching JST SM type receptacle connector.
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US$3.42
By popular demand, we now have a handy extension cord for all of our JST-terminated battery packs (such as our LiIon/LiPoly and 3xAAA holders). One end has a JST-PH socket, and the other end has a matching plug. Between the two, 500mm of color coded wire.
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US$59.95
The PN532 is the most popular NFC chip, and is what is embedded in pretty much every phone or device that does NFC. It can pretty much do it all, such as read and write to tags and cards, communicate with phones (say for payment processing), and 'act' like a NFC tag. If you want to do any sort of embedded NFC work, this is the chip you'll want to use!
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