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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.
The bigger the tank, the longer the Betta fish life expectancy. Having space to swim, explore and hide is crucial to a Bettaâs life expectancy. You should have at least a two-gallon tank for you Betta, but a five-gallon tank is preferable.