Other than Inland Bearded dragons, Rankins (Or lawson's) bearded dragons and Eastern bearded dragons (P. barbata), no others are in the pet trade. Until Australia lifts the ban on exporting natural wildlife or gives out permits for limited exportation...or special cases...I doubt there will be any other species of bearded dragons available... Vittikins bearded dragons are a hybrid, (Eastern x Rankings) not a separate species of bearded dragon.
Anybody selling any other kind of bearded dragon I would be very very leery about. Either they are false advertising, have no clue what species of bearded dragon they are selling or bought it from a smuggler or are smuggling...or are scammers.
-----
PHLdyPayne