Adafruit

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US$13.92
This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on.
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US$27.25
With this shield you can make a cool Arduino robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts.
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US$7.62
The heat sink is a 0.25" x 0.25" (6.5mm x 6.5mm) square with 9 little 'fins' sticking out the top. The total height is 0.15" (3.65mm) so it will fit in any case or enclosure. They even come with a bit of thermal tape already on the bottom! Ideal for medium flat BGAs, TSSOPs, QFNs, etc!
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US$12.17
Finally, a way to get up to 8 same-address I2C devices hooked up to one microcontroller - this multiplexer acts as a gatekeeper, shuttling the commands to the selected set of I2C pins with your command.
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US$5.17
We decided to stock this food-safe heat shrink specifically for people who were building beer-brewing or sous-vide projects using our waterproof DS18B20+ digital temperature sensors. This heat shrink is FDA Compliant for contact with food.
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US$13.93

The cable is easiest way ever to connect to your microcontroller/Raspberry Pi/WiFi router serial console port. Inside the big USB plug is a USB<->Serial conversion chip and at the end of the 36" cable are four wire - red power, black ground, white RX into USB port, and green TX out of the USB port. The power pin provides the 5V @ 500mA direct from the USB port and the RX/TX pins are 3.3V level for interfacing with the most common 3.3V logic level chipsets.

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US$13.13
This is a nice way to add a small-distance proximity sensor to your microcontroller project.
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US$2.02
The heat sink is a 0.26" x 0.26" (6.75mm x 6.75mm) square with 3 tall 'fins' sticking out the top. The total height is 0.39" (10mm) but you can easily file it down if you need a shorter heat sink to fit in a case).
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US$13.13

This breakout board has a microSD card slot for providing extra storage memory when required.

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US$69.92
This is the easiest way possible to add small, bright RGB pixels to your project. We took the same technology from our Flora NeoPixels and made them breadboard friendly, with two rows of 3 x 0.1" spaced header on each side for easy soldering, chaining and breadboarding. These ultra-bright LEDs have a constant-current driver cooked right into the LED package!
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US$4.38
We now have very useful 4-wire polarized cable sets in a waterproof variety. These cable sets are ideal for projects that must weather the weather: dust, water, rain, snow, tornado (not volcano proof!).
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US$34.92
This slim little board has a class D amplifier onboard that can drive 2 channels of 4-8 ohm impedance speakers at 20W each. Power it with 5-12VDC using the onboard DC power jack and plug stereo line level into the 3.5mm stereo headphone jack and jam out with ease.
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US$14.00
They are 940nm wavelength, which is what nearly all devices listen to. They're 20 degree beamwidth, and work great for any kind of remote control application. 
Delivery within 2-3 weeks
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US$26.17

This incredibly small stereo amplifier is surprisingly powerful - able to deliver 2 x 3.7W channels into 3 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC.

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US$17.50
This one has an adjustable delay before firing (approx 0.3-18 seconds), adjustable sensitivity and we include a 1 foot (30 cm) cable with a socket so you can easily reposition the sensor or mount it using the two drills on either side.
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