I got some SK6812 V3 LED'S or whatever the RGBW 'Neopixel' things are from there a while ago- really nice ordering experience, I don't remember having any problems with it, and they include datasheets, which is awesome.
I never bought from Black Hole (Rob Blessin) directly since shipping to Europe is rather expensive, but Rob is a long-term NeXT supporter and also very active on the nextcomputers.org forums - so I would recommend getting in touch with him if you are interested in buying a system.
I think his company is mostly a single-person operation, so I would expect response times sometimes a bit longer than what you might be used from larger companies.
https://market.yandex.ru (only in Russian). Exists for over 10 years. Was my to go place to shop for electronics due to extensive filtering. It actually still is even after moving to US: I just pick the device there, then order on BestBuy/Amazon/NewEgg.
If you go to the Pricing tab you'll see links to buy the parts through popular North American and European distributors. This data is supplied via Octopart.
Kjell (my example from earlier) has physical stores throughout Sweden. Their offerings aren't super deep, but they have plenty of kits and common parts to get started with.
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