They have marble and koi bettas, along with standard veiltail.
When I was looking at the betta fish, I saw a large variety of different types, yet as not being a die hard fish guy, I couldn't say how many varieties. Give the place a call, they have a wonderful staff, just ask for someone like Jordan. He knows so much about the fish there!
They have a pretty good selection of better. Not sure about the kinds of though.
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