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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.
But betta fish can last like five years if well taken care of. On the other hand one wrong move can cost your betta its life. Not that they are super demanding or anything. Yet this is what makes owning a betta exciting. And a bit challenging.