I do not believe you need a tobacco license to sell glass tobacco pipes at the flea market in Florida. The license is required only for people who make, sell or deal in cigarettes in any way. Talk to someone from the Florida Department of Business and Professional Regulation for clarification.
You don't need a tobacco license. However, you need to check on local zoning for smoking accessories. Some county or city ordinance may consider it paraphernalia. You should check with them before you spend a bunch of money on inventory. If nobody else at the flea market sells them, there's probably a good reason.