Adafruit

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$7.61
A button is a button, and a switch is a switch, but this LED illuminated arcade buttons is in a class of its own. Its the same size as a 'standard' 30mm arcade but has a built in LED that can be controlled separately from the switch action - either to indicate or just to look good. 
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US$6.92
The LED is very bright, with 90 Lumens in a 140 degree lambertian pattern.
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US$5.17
Each pack contains five 36-pin long headers, 0.1" pitch. They're even gold plated so they wont oxidize! You can cut these down to different sizes fairly easily. First, count how many positions you want as the final piece, then pull out the next pin using a pair of pliers. Finally, cut through the empty spot with diagonal cutters. You can clean off the half-spot using a file or with the diagonal cutters. These are 'standard' female 0.1" headers such as used on dev boards like the Arduino. If you have something with 0.1" square-pin male header on it its almost certainly going to match with these (the only exception is 'round' swiss-pin headers, but those are not as common).
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US$15.67
This proto-board is the PCB you always wish you had, but never realized it! We took the basic layout of a quarter-sized breadboard (basically, a 'tiny' breadboard plus power rails) and turned that into a beautiful PCB.
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US$174.92
These are the same glorious 2048x1536 retina-blasting, ultra-high pixel density, IPS displays you may have seen in iPad 3 or 4's. This product comes with only the brand new 9.7" diagonal TFT display module, no driver thunderbolt connector!
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US$13.13
Use the USB Charger Doctor to measure the working voltage and current output for any USB port and project. This blue plastic dongle plugs between a USB device, and passes the data lines through.
Delivery within 2-3 weeks
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US$1.32
Add a micro-slice standard solderless breadboard to your Perma-Proto or other perf-board. This 2x4 point solder-less breadboard is a good way to add some solderless prototyping space if you just need to have a couple points.
Delivery within 2-3 weeks
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US$7.00
Pack of 25 diffused red LEDs. 5mm diameter. 660 nm wavelength. 1.85-2.5V Forward Voltage, at 20mA current. 250 mcd typical brightness. 
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US$33.81
Aww yeah, it's the Feather you have been waiting for, and now with stacking headers! The HUZZAH32 is our ESP32-based Feather, made with the official WROOM32 module. We packed everything you love about Feathers: built in USB-to-Serial converter, automatic bootloader reset, Lithium Ion/Polymer charger, and just about all of the GPIOs brought out so you can use it with any of our Feather Wings. This version of the ESP32 Feather comes with stacking headers already soldered in. That module nestled at the end of this Feather contains a dual-core ESP32 chip, 4 MB of SPI Flash, tuned antenna, and all the passives you need to take advantage of this powerful new processor. The ESP32 has both WiFi and Bluetooth Classic/LE support. That means it's perfect for just about any wireless or Internet-connected project.
Delivery within 2-3 weeks
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US$5.17
This little dongle will let you connect one of our 5V 2Amp or 5V 10Amp adapters to something that expects to connect to USB. The premise is simple - one end has a USB A female jack and the other has a 'standard' 5.5mm OD/2.1mm ID barrel jack with center positive polarity. 
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US$2.02
Make your own USB connections without slicing apart a USB cable and soldering those thin wires inside. These DIY "USB shells" are available in USB A plug 1387-ADA, and micro B.
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US$7.62
These Simple RF receivers are the easiest way possible to add wireless control, painlessly! There's no programming, configuring or addressing - simply power the receiver with 5-10VDC and press the buttons on our matching RF keyfob remote. When the A button is pressed, it activates the first pin, when the B button is pressed, it activates the second one, and so forth for all four buttons. There's no microcontroller required, its just a simple one-to-one link.
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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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