LED Light Strips (12v - cut every 3 lights): https://amzn.to/3jx9BMz
Arduino Pixel Board: https://amzn.to/2WNKECZ
Capacitors for Lights
A kit with many types: https://amzn.to/30xEVCm
The ones we use for 12v neopixels: https://amzn.to/2ZOlkib (we buy them individually, but you can find kits like this on Amazon)
You can find the wiring diagram we always use here: https://learn.adafruit.com/adafruit-neopixel-uberguide/basic-connections
Single LED with Multiple Colors
With a controller (Neopixel): https://amzn.to/3hsdFfy
Without a controller (wire and control yourself, not recommended): https://amzn.to/2OMFy5B
Arcade Switches (the ones we like)
Round: https://amzn.to/3hsCwQk
Square: https://amzn.to/3hkUaVY
Light Valves
Light Valve: https://amzn.to/2ZQEfZG
Also available from Adafruit: https://shop.smarttint.com/SAMPLE-TEST-KITS_c_308.html
Christmas Light
These can be cut and are individually addressable with Neopixel libraries: https://amzn.to/2D2fArZ
These are the kind I talked about that cannot be cut and have several parallel runs (not usually recommended): https://amzn.to/2OOzxFy