What tail type are you looking for? That will help us narrow it down more.
tmtbetta, 3dbetta, Banleangbetta, bettaakapes, majcha_farm, aquastar71, Chard56, patsayawan, and lots more are really good. Catw0man is the expert on this and has tons of experience... Hopefully she'll weigh in.
Of course, I've got to tell you that there are quite a few good breeders right here in Alberta... Logisticsguy has some halfmoons available at the moment (his females are especially nice) and I will have some really neat fish available by the new year.