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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.
I personally will not keep a betta in under 5 gallons. I recommend no less than 2.5 gallons. 2.5 gallon tanks and above are easy to heat, need to be cleaned much less often, and result in a happier and healthier betta. Contrary to popular belief, there is no maximum, and bettas do not like small spaces. Bettas kept in larger tanks are healthier and less prone to problems such as ammonia burn, bacterial infections, and obesity (one of the leading causes of betta death). Type: Acrylic or glass aquariums are both appropriate for bettas.