0monoverdeBest Answer 8 years ago ReplyUpvoteAny number of people have started selling things from their lockers. candy, school supplies, collectibles. School rules sometimes forbid this. The classic lemonade stand is an option. Summer is coming up. Mowing lawns is a businesses that has a nice repeat sale built in. Dog walking, babysitting, math tutor to younger kids are other things that pop to mind.