Can I give 2 bettas for store credit? When do they restock the betta fish?

I honestly don't know how to answer your question, but I would assume the best way to get your question answered would be to call them and ask

My son has turned in a few of his fish for store ctedit, but they weren't betas. I would imagine its not alot of store credit, but my son shops there ALOT....Alot.

Only if they accept your offer. You should call first before you try.

I would call the store