I don't mean to burst your bubble but you won't find a complete private build for sale. It's a lot of work to invest into a project that may or may not sell, or even work out at all.
The cheapo one is supposed to last more than two weeks. Mine didn't. Assuming mine was a fluke-- You still get what you pay for. If you're only looking to get white and magenta, maybe it's perfect for you? You get 7 colors, so that means no fine tuning to get yellow, orange, mint green, pink, etc. White balance was off, mine was kinda on the blue side but I'd still call it white, just cool white. The alignment was a bit sketchy as it was easy to see the component colors.
The green diode died in two weeks. I didn't attempt to send back and replace or buy another, it's on my bench waiting to get dismantled to see if I can replace the diode myself, though I haven't found the time to do it yet. There's a ton of glue to get past...