I wasted so much money trying different types of foundation in different shades in an effort to find the right one. I tried all the drugstore brands - Cover Girl, Maybelline, etc. But none of them worked, even though I bought every possible shade for my skin tone (I'm Korean). I then tried buying foundation online from makeup brands that are formulated for Asian women (yellow undertones), such as EX1 Cosmetics, but that still didn't work for me. All of their shades were too dark.
I finally gave up and went to a MAC Cosmetics store and got colormatched. I'm not too happy with having to spend $40 for foundation, but all the cheaper brands just didn't work for me. I should have just gone to MAC in the first place!
Incidentally, Shisheido foundation also works for me, but that's even more expensive than MAC.