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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.
Depending on where you buy your bettas you can often find out exactly how old your fish is. Breeders will certainly know the age of their bettas and smaller Ma & Pa fish stores may also know. If you buy yours from a large chain store you are often buying a fish that is already between 6 months to one year old.efore that time approaches you may notice your betta illustrating signs of aging, many of which can be observed in humans. Here is a male betta at one year showing vivid colors and iridescents. The average life span of bettas varies from 2 to 5 years.