Selling small amount of mice?

I am considering building a small 6-tub mouse rack just to test the waters, and I was wondering if I would be able to sell the small amount of mice? I live in a small town but do you think a petco would buy 30+ mice a week? I really just want to see if it is something I would be interested in, but I want it to at least pay for itself. How do other people start? thanks guys!

Petco and Petsmart usually don't buy from individual people, they have suppliers. You should always talk to people to make certain they are interested in buying, and then don't count about half of them.