Feel free to plug your favorite shop for lighting elements here.
Also if we want to do a group purchase this would be the place to coordinate!
I’ll start. My absolute favorite (I have no financial connection to them) is
www.adafruit.com especially her neopixel selection.
https://www.adafruit.com/category/168
The best part of shopping at adafruit are the tutorials with code and wiring instructions that help you take that first leap into wiring up your first project. Once you know the basics the sky is the limit.