It sounds like you're planning to use non-addressable RGB strips. If so, I can recommend this inexpensive DMX decoder, which can drive four RGB strips. I used a bunch for a project last year, and didn't have any issues with them. And here's another DMX decoder I've used that can handle one addressable strip (like WS2812b or WS2811) and 5 channels for non-addressable strip.

I've had good luck with LED strips purchased from Amazon, mostly from these suppliers: Alitove and BTF-Lighting.