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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.
If your fish is not that old then my advice is to look after it properly by following the rules which are.:- 1 inch oâ¦f fish needs at least 1 gallon of water (a Betta is a 3 inch fish and needs at least 3 gallons). :- Every tank needs a permanently running cycled filter.