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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.
How long will the average Betta fish live? i had one for 3 years and my daughter changed his water for me one day ( unknown to me at the time ) and used regular tap water and killed it. so, i have bought another. he is in a cylinder shaped tank... pretty rocks and that is it...