all the sellers here in the buy&sell forum are reputable i personally dealt with rehoboth aquatics and rare afishinado and they were great and have heard nothin but great things about the others
Never bought yet, but the sellers on this website seem to always have a good rep. I especially like rare fish aka fugupuff cuz he promises fish to be LIVE on delivery. Just my two cents!
Tangled Up In Cichlids Jeff Rapps (Tangled Up In Cichlids) is one of the most reputable Cichlid dealers in the USA. I have done about 4-5 orders from him over the last couple years and the fish always arrive alive and healthy.