Good suggestions by everyone. I second just about all of them.
Hand sanitizer - and in my case I actually don't let anyone handle my snakes unless they've already expressed a very focused interest in buying. A lot of germs in there and people who are handling for the sake of it are probably handling some cool rare reptiles (read: wild caught) that you don't want anything to do with.
In terms of selling ENGAGE THE CROWD. I see a lot of people that just sit there silently the whole time. This is not going to sell animals. Ask questions, talk to them about anything and everything. Be reputable and trustworthy and people are more likely to pick you instead of the other 80% of people selling the same thing. I also find having fewer animals like you will have tends to help my sell-through. People who are overwhelmed with options take a glance and keep moving.
Good luck!