When you boil it all down, you find the best prices on made-in-china, ebay, and diy-cnc sites that buy bulk and kit out parts. The reality is that 99% of them are made in asia already, so you need to rely on reviews - likely on forums - for a particular brand where people can say whether a part is trustworthy or bogus. GENERALLY: Everything I buy direct from china works. I pay less tax, virtually no markup, and free shipping. If those conditions aren't present, buy elsewhere. Also, get stuff with a good return policy - just to be sure.