I been reading many threads and I haven't seen anything on finding quality seeds. I used to get them online through a friend but that was years back and I don't know if thats a good idea. Also, most of the sites nowadays won't send to U.S. I dunno where to look.
Man there are a ton of threads on this... dont know how you didnt find any... but anyway... check out seedboutique.com and seedbay.com