Generally fishstores double the wholesale price, but some do triple it. There is a HUGE mark-up on all things live and a small mark-up on drygoods. Again, that is a generality and every fishstore is different. I would ask for 2.50 if you are selling them 50. I prefer to get cash that I can spend as I like. Credit works out very well for the fishstore because your shrimps will end up costing them even less in the end. If you are getting store credit instead of cash I would sell them at a little higher price.