I did a show a couple of years ago and below are my thoughts on what worked:
1) Definitely have change as best you can. You don't want to miss sales because of this.
2) Have "bargain bins" for the lower priced stuff such as inserts and parallels. What I had was a $0.25 per card box of these types of cards which was very popular. I also had a auto box (if they have a bunch) which was $5 each or 3 for $10. This helped moved the lower priced autos
3) Invest in a case if they have higher priced items. You might be able to rent or borrow from your LCS which is what I did. Also if they plan to do this more than once you can sometimes buy old ones from other dealers.
4) Engage in discussions with the customers. Ask them if there is anyone specific they are looking for. Worst thing is going up to a booth and having a lame seller who never talks.
5) Use as a trading or buying opportunity. They might be able to pickup some stuff using the money they make or even make trades outright.
Have fun and good luck!
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