Cool Byedan, I wish you luck. I live in East Ridge and Vintage Vapors is where I get my juice and my first setup, and some odds and ends. I am heading there tomorrow for a resupply of juice and some new flavors. I love they let you sample their flavors.
What are you going to try and sell at the flea market? I think if you could get some evo twists and some ts3 type tanks,replacement heads etc and sell them less than vintage does, you would do ok. Also, DRIP TIPS! Everyone likes to customize what they already may have etc and it isn't a big. Just some thoughts tho.
Good luck man, let me know when you set up and I will come check it out.