It depends on your local laws. I've recently found out that to sell anything you should have a business licence, just to CYA. I was under the impression that as long as you didn't make over a certain amount you didn't need one, this is mostly for federal. Some local laws say that even if you're having a yard sale or lemonade stand more than twice in a year, you have to have a business licence and collect taxes. You're running a business out of your home, so you should probably contact your local Chamber of Commerce just to be safe.