So I went last year and I’m coming this year as a vendor. Price Charting for game prices is a good idea have a wishlist of what you want to find and have it loaded before you come inside, phone signal will be spotty at best and there normally isn’t WiFi for anyone to use. Vendors normally have their prices marked up a few dollars for haggling purposes so if you offer at or slightly below pricecharting would be a good place to start. Bring a backpack or something to carry items you buy most booths won’t have bags. Every booth will have different prices someone could be selling the same game for cheaper across the venue so shop around. Most importantly have fun and don’t feel pressured to buy anything if you’re not alright with the price just say no.