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Best Answer: Usually common Betta's are very cheap. Ranging from $2.00 to $7.00, but they're are two very expensive breeds. The Western Blue devil is around $600.00 and the Marine Betta is about $70.00.
Put two males in a tank, and one of them will kill the other. Females aren't safe, either. When a male isn't interested in breeding, he might do in a female betta. You do need fish experience when breeding bettas, because putting the male and female together at the wrong time can lead to disaster.