Adafruit

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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US$4.70
It's 6" long and has 26 socket & wire sets. Pin #1 is marked with a red wire.
Delivery within 1-2 weeks
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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$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$12.17
Trinket may be small, but do not be fooled by its size! It's a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM.
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US$26.17
This is the FeatherWing OLED: it adds a 128x32 monochrome OLED plus 3 user buttons to any Feather main board. Using our Feather Stacking Headers or Feather Female Headers you can connect a FeatherWing on top of your Feather board and let the board take flight!
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US$34.94
This Japanese upgrade to the classic $5 solder sucker is a joy to use. Since the tip is rubbery soft silicone you don't have to worry about it melting. You also get a long tube in case it gets clogged or dirty.
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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$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$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$43.67
The LEDs are individually addressable, so you can use it to display anything in a 9 x 14 grid. Scroll text, play games, display images, or anything else you want to do. This kit you will need to assembled / solder it together.
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US$24.50
A stepper motor to satisfy all your robotics needs! This 4-wire bipolar stepper has 1.8° per step for smooth motion and a nice holding torque. The motor was specified to have a max current of 350mA so that it could be driven easily with an Adafruit motor shield for Arduino (or other motor driver) and a wall adapter or lead-acid battery.
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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$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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