There's 2 etops on aliexpress. I've used the one from the Wiki, with no issues. fast service, good prices, quick delivery, and (IMHO) better pixels than some other vendors:
Etop Technology Co(China): RGB strips, modules, etc.
Etop is @Paul Zhang I can vouch for the quality of his products. I ordered from him my first year. One of the neon strips (the ones with the milk white cover - looks like rope light) was defective on arrival, he promptly replaced it. One of the neon strips has a dead pixel now, but that is strip and to be expected. The 12mm pixels I ordered from him are all still working. I am going into season 4 and haven't had to replace one yet. Last year I ordered some pixels from Ray and I already had to make replacements. Could be the luck of the draw, I feel the quality is similar. I do much prefer Paul's pigtails though.