I wouldn't, I've got a thing about flea markets when it comes to animals. I know that some people will take good care of them and all, but I'd rather go to a trusted breeder for my animals.
Idk. I'm a bit torn about this. On one hand, it'd be a great way to educate people about leos and to have less people buying from petstores, especially if you advertise. However, I feel like a lot of people who are uneducated about keeping a leo will buy one and do who knows what with it. Or they will feel as though they are too expensive. It's a toss up for sure.
I say, give it a try though. At least for a couple of days. See who comes to visit! Though I don't need anymore leos, I may stop by and say hi anyhow! If it's not working out then you can close up shop. No loss.
Whatever you decide to do, good luck! And let us know if you do decide to do the flea market, like I said, I may stop by and see what you've got!