Yes, if you are selling a reptile in FL you need the class III permit. The permit is no big deal to get...much cheaper than the fine for not having it. I hear of stings periodically...F&W officers visit craigslist, forums, facebook etc. and try to catch people selling without the permit. You do not need the permit to buy reptiles, only to sell them, but I strongly recommend getting the permit if you will be selling, because they do enforce it.