Adafruit

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$42.72

Add a typing interface to your project with this microcontroller-friendly miniature keyboard. We found the smallest PS/2+USB keyboard available, a mere 8.75" x 4.65" x 0.6" (220mm x 118mm x 16mm)! It's small but usable to make a great accompaniment to either a microcontroller project or a computer such as the Beagle Bone or Raspberry Pi.

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US$12.17
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$2.53
This 1.5" diameter speaker cone is the perfect addition to any audio project where you need an 8Ω impedance and are using 0.25W or less of power. We particularly like this cone as it's very simple and its plastic body is extremely lightweight and thin.
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US$2.49
If you need to connect a battery pack or wired power supply to a board that has a DC jack - this adapter will come in very handy! There is a 2.1mm DC plug on one end, and a screw terminal block on the other.
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US$19.95
This nifty adapter cable has a classic HDMI plug connector at one end and at the other end a DB-15 VGA connector (it has hex nuts that you can remove if you are trying to mate it with a cable that also has hex nuts). There's also an audio jack on the side, this provides stereo headphone out.
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US$3.93
This is a simple plastic casing with two elements - an IR LED and an IR phototransistor.
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US$5.17
Each LED is encased in a 3.5mm thick strip of a acrylic.
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US$26.17
Timing belts are a fantastic way to transfer rotational motion (from a stepper motor) into linear motion (along a rail) and these GT2 belts are excellent for the task. 
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US$2.63
This electret capsule microphone is the same one we use in our great microphone amplifier board. It contains a small vibrating element that will output a few milllivolts peak-to-peak.
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US$21.00

This breakout AVR board is a prototype design with minimum components. We took the business-card-sized AVR target board from Evil Mad Scientist Laboratories and added a few components to make an AVR dev board that has only the bare minimums!

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US$12.17
The NeoPixel is 'split', one half is the RGB you know and love, the other half is a white LED with a yellow phosphor. Unlit, it resembles an egg yolk. Lit up these are insanely bright (like ow my eye hurts) and can be controlled with 8-bit PWM per channel (8 x 4 channels = 32-bit color overall). Great for adding lots of colorful + white dots to your project!
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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$23.45
This high power 4" diameter speaker will amp up any audio project where you need loud sound! It is 4 ohm impedance, rated for 20W continuous power. (This thing is really loud) It also has four handy mounting tabs 3 inches apart, and a grill that fits on top. The grill is to protect the cones, and is not necessary for use. 
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US$12.25
The T-Cobbler Plus is an add on prototyping board from Adafruit specifically designed for the B+, Pi 2 and Pi 3 that can break out all those tasty power, GPIO, I2C and SPI pins from the 40-pin header onto a solderless breadboard. This set will make "cobbling together" prototypes with the Pi super easy.
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