Adafruit

US$10.42
These chrome-plated metal buttons are rugged and waterproof and look real good while doing it! Simply drill a 16mm hole into any material up to 1/2" thick and you can fit these in place, there's even a rubber gasket to keep any water out of the enclosure.
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US$7.73
This mini USB hub has four USB 2.0 ports each with a max total transmission speed up to 480 MBps. All four ports are powered thru the USB micro-B cable. There's also a single on-off switch that controls the four USB ports.
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US$3.42
A high quality molded 2.1mm DC barrel jack is brought out to red (center positive) & black (ring negative) alligator clips. Works with just about every wall adapter, good for about 2 or 3 Amps of current and up to 24VDC.
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US$3.00
This cable will let you swap out the stock 150mm long flex cable from a Raspberry Pi Camera (either 'classic' or 'NoIR' type) for a different size.
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US$12.17
We've upgraded our basic 'adjustable' wire strippers to these multi-sized wire strippers. They include: 22-30 AWG strippers, wire cutters, 'plier' tips, and a wire loop. Ground blades for precision cutting. Spring return, comfy molded handles and a closing-lock. 
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US$30.63

This is a DC plug Arduino compatible kit with an ATmega328 chip. This clone acts just like an Arduino, and works with the latest Arduino software. For many projects it can even be preferable! The kit includes all parts necessary, the assembly is straightforward and well documented.

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US$2.41
uFL connectors are very small surface-mount parts used when an external RF antena is desired but a big bulky SMA connector takes up too much space. We use this part on our GPS and WiFi boards, they're great!
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US$9.95
Stacking headers are a twist on the standard/common male and female header sets. In this case you have one header that has a socket on one end, and a long tail that gets soldered through a PCB. When soldered into a through-hole pad, the long tails can plug into another board's female headers while the sockets above the PCB allow another board to be plugged in. This means you can stack PCBs, as many as you like, on top of each other. You can even plug the lower board into a solderless breadboard, or plug wires into the top board's sockets.
Delivery within 2-3 weeks
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US$8.67
This adapter board is designed for adapting a 'classic' 2x10 (0.1"/2.54mm pitch) JTAG cable to a slimmer 2x5 (0.05"/1.27mm pitch) SWD Cable.  It's helpful for using products like theJTAGulator or SEGGER J-Link with tiny boards that use the 10-pin SWD programming connector.
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US$69.13
Need a massive battery for your project? This lithium ion pack is made of 3 balanced 2200mAh cells for a total of 6600mA capacity! The cells are connected in parallel and spot-welded to a protection circuit that provides over-voltage, under-voltage and over-current protection.
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US$6.13
Hook up this 5V Mini Cooling Fan and prevent your hard-working Pi from overheating! Of course, it's also great for use with any small computer or FPGA or motor driver or anything that needs cooling. Plug the fan directly into your Raspberry Pi's 5V+GND GPIO power pins, as shown, for instant cooling! Place in your case, or even better, on top of your Pi's CPU to give it extra air-flow. Compatible with any and all Raspberry Pi computers but only the Pi 3 runs hot enough to benefit from any cooling, when doing intense computations.
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US$7.95
Measuring approx 1" x 6", this standard-thickness FR4, gold plate ruler has the most common component packages you'll encounter. It also has font size guide, trace-width diagram, and a set of AWG-sized drills so you can gauge your wire thicknesses.
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US$8.67
Design your own Pi HAT, attach custom circuitry and otherwise dress your Pi A+ or B+ with this jaunty prototyping HAT kit.
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US$2.63
These headers are particularly cute and tiny with a body height of just 5.0 mm they are the best way to minimize the amount of space your Feather project takes up, but still maintain that flexible configuration. "Normal" socket headers have an 8.5mm body height so this saves you a whole 3.5mm (hey it adds up!).
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US$6.92
There are 16 pins on the side, 8 on each, with 0.1" spacing so you can easily plug it into a breadboard with plenty of space to wire it up.
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