It happens sometimes, unfortunately.
to go with a betta (assuming splendens) I would personally try to find one from a breeder. I don't know any stores in north jersey that would sell anything other than asian farm-raised (But It's not something I'd personally look at or into either, I've just not seen anything declaring that). I know that there are frequently Bettas in the North Jersey Aquarium Society monthly auctions.
Another option would be one of the more peaceful betta species, that can be kept as pairs in an aquarium.