Adafruit

US$30.63
Add a good quality, slim keyboard to your Raspberry Pi, Beagle Bone Black or other mini-computer with this sleek black chiclet keyboard. It's a full QWERTY keyboard with a wireless USB dongle and is compatible with all operating systems.
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US$10.42
This button is a momentary push button, when you press it the 'normally-open' contact shorts to the common contact. When you release it, the contacts open up again. The switch and LED are separated, so you could wire it to turn on when pressed or vice versa or whatever you wish!
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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. 
Delivery within 2-3 weeks
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US$17.42
This item is just for the Trellis driver PCB assembly: LEDs and buttons not included. Trellis is an open source backlight keypad driver system. It is easy to use, works with any 3mm LEDs and eight tiles can be tiled together on a shared I2C bus.
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US$4.70
It's 6" long and has 26 socket & wire sets. Pin #1 is marked with a red wire.
Delivery within 2-3 weeks
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US$5.17
This super slim, super tiny, and super cute Micro-B to USB on-the-go adapter is so slim, tiny, and cute that we'd pinch its cheeks if it was big enough to have cheeks.  At just ~15.5mm long, ~11.3mm wide, and ~2mm, this really is the tiniest little adapter we've probably ever seen.
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US$26.17
METRO Mini is the culmination of years of playing with AVRs: we wanted to make a tiny, breadboard-friendly development board that is easy to use and is hacker friendly. Metro Mini can be programmed with the Arduino IDE (select 'UNO' in the boards dropdown).
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US$8.67
This coupler will connect a 5mm diameter shaft to an 8mm diameter shaft. A perfect add on for our stepper motors. Comes with two sets of double set-screws (two per side) for secure attachment. 
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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!
Delivery within 2-3 weeks
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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$13.13
These particular pins are (in our opinion) ideal because they are skinny enough to fit into proto board or perf board - they have a 1.0mm/0.04" diameter body (the gold part) but the spring contact head is 1.5mm (0.06") wide. The uncompressed length is 16.5mm/0.65", compressed is 14mm/0.55"
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US$19.17
90 degree viewing angle. You can plug these into a breadboard diagonally. These are Common-Anode type which means you connect one pin to 5V or so and then tie the other three legs to ground through a resistor.
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US$9.45
We now have an all in one digital audio amp breakout board that works incredibly well with the Raspberry Pi! If you're looking for an easy and low cost way to get you digital sound files bumpin' then the MAX08357 I2S Amp Breakout is for you. It takes standard I2S digital audio input and, not only decodes it into analog, but also amplifies it directly into a speaker. Perfect for adding compact amplified sound, it takes 2 breakouts (I2S DAC + Amp) and combines them into one.
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US$30.95
This lovely little display breakout is the best way to add a small, colorful and bright display to any project. Since the display uses 4-wire SPI to communicate and has its own pixel-addressable frame buffer, it can be used with every kind of microcontroller. Even a very small one with low memory and few pins available!
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US$1.90
That's one tiny microphone! At about the size of a mature aphid, this wired Electret Microphone is perfect for your FONA. Diameter: 4.4mm. Wire Length: 67mm. Weight: .17g.
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