Adafruit

US$4.38

We're carrying this adapter primarily to allow Chumby Hacker Board users to adapt our nice 5V @ 2A power supply to their CHB. But you can use this adapter for anything else that has a 1.7mm DC jack, such as a PSP.

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US$3.42
Stretch out your servo connections with this flexible servo extension cord. It has a 3 pin shrouded "male" connection to plug your servo into and then, 30cm later, a 3 pin female connection. It even keeps the common red/black/white color coding.
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US$13.13
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$5.17
Three rows in a right angle header!? Yes! These chunks of 0.1" header has yet-another-row - handy for when you want to connect cables that come in sets of three, like perhaps sensors, or servos. These plug into any standard 0.1" spacing perf-boards or other PCBs and work nicely with our female-ended wire sets.
Delivery within 2-3 weeks
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US$26.95
This is the Adafruit METRO with headers.  It comes with headers soldered on.  It's a fully assembled and tested board with through-hole headers attached.  METRO is the culmination of years of playing with AVRs: we wanted to make a development board that is easy to use and is hacker friendly. At the heart is an ATmega328P, with 32KB of flash and 2KB of RAM, running at 16 MHz.
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US$6.09
Squeeze once to turn on, squeeze again to turn off! This clicky switch makes a great power switch or mode toggler. We like this switch because it's easy to embed in a seam for easily powering up/off wearable and fabric projects. Can handle up to 14V and 2 Amps! This is a really satisfying switch.
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US$34.92
The Bluefruit LE SPI Friend makes it easy to add Bluetooth Low Energy connectivity to anything with 4 or 5 GPIO pins. With SPI, you don't have to worry about baud rates, flow control, or giving up a hardware UART port. Connect to your Arduino or other microcontroller using the common four-pin SPI interface (MISO, MOSI, SCK and CS) plus a 5th GPIO pin for interrupts (to let the Arduino know when data or a response is ready).
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US$3.42
There are 20 pins,10 on each side, with 0.1" spacing so you can easily plug it into a breadboard with plenty of space for wiring left over.
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US$21.45
This is a nice, bright alphanumeric display that shows letters and numbers in a beautiful blue hue. It's super bright and designed for viewing from distances up to 23 feet (7 meters) away.
Delivery within 2-3 weeks
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US$24.52
This handy combo-hub has 3 USB 2.0 ports, and a AX88772A Ethernet transceiver. This chipset is really common and can be used by any Linux, Mac or Windows computer. It's particularly handy for the  Raspberry Pi A+ or brand new Raspberry Pi Zero which is tight on USB ports and has no Ethernet out. We did some basic tests and got 11+ MB/s transfer speeds on our Pi Zero.
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US$28.00
Not only does it have a large 0.1" grid prototyping area but it also extends the Arduino pins to sturdy, secure, and dependable screw terminal blocks.
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US$34.92
The enclosure comes as 6 laser cut acrylic pieces, 4 plastic standoffs, 8 hex-nuts and 8 1/2" 4-40 screws. Assembly is easy, and requires only a Phillips screwdriver. Once assembled, the box has lovely engraved ends with cut-outs for the DC power, Ethernet, microSD card, USB host and USB debug ports.
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US$6.03
This RF adapter bit is great for anyone doing RF work. Depending on the dev-board and antenna you have, you may be faced with either RP-SMA or SMA connectors. Unfortunately they are not compatible! This adapter solves the problem with an SMA jack on one end and an RP-SMA Plug on the other.
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US$17.42
This button has a domed white plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
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US$4.24
The buttons screw in place, so you can use with up to ~15mm thick material, and will cover up if the hole if it isn't perfectly round and clean. The action is smooth, without a strong click, yet you can definitely feel when the button is pressed. A tiny micro-switch is pre-installed, with gold plated contacts.
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