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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.
It depends what food the other fish eats. Bettas are carnivorous, so they eat meat. If the betta food is meat (which it most likely is) and the fish you want to feed is a alsoâ¦ a freshwater carnivore, then, chances are, you can feed the fish betta food. 4 people found this useful.