Got burned a couple of time buying cheap cards on fleabay awhile back- too many counterfits there for me to go that route again.
I picked up a couple of less than $20 16GB class 2 cards from Amazon when I first got my Samsung Moment. Not sure why people are obsessed with the transfer rate of the faster cards. Might make a difference if we ever get the ability to run programs from the card, but for media storage the cheaper class cards work fine.