If you do try to sell excess to a pet store I will give you the best case scenario. Sell them where you shop. If you spend your dollars there, they will be more likely to want to work with you in a business capacity. That is a little marketing technique called "following your dollar" and it is especially fruitful with small business owners. Also, a lot of small pet store operate on a tight budget with limited expendable liquid cash. This means that you are likely to get store credit. In most scenarios the best that you can hope for is to get a 50% store credit at their selling price. So, if they are selling a small rat for $3.99 then you are likely to get a store credit for $2.00 for that animal. This is really the best case scenario. You may also want to try bartering. You can offer them things at a wholesale price, for them to order you things at a wholesale price and you do an even exchange. For instance, if you breed ball pythons you might go through a ton of cypress mulch. When you buy a bag you get it at retail price. When they buy a pallet they get it for wholesale price. However, the wholesaler will not sell to you because you do not have a business license. You can work with the small business owner to order you a pallet at their price, and you can trade them the equivalent amount of rodents at a wholesale price for the pallet of cypress mulch. Never expect transactions to exceed a few hundred dollars on either party's end and always expect to be at the mercy of the need of the store owner. They will not always be available as a dump off every time you need to unload a few hundred rats. They are helping you out, so you are at the mercy of their need and not your want. If you keep all of these things in mind, you can avoid disappointment on your end and keep your business relationship strong.