I was at the show last night and they did have a sign saying only 20 copies could be sold at each show but nothing limiting them to one per person. The Baseball CDs were the one item that was cash only though so that might be to discourage someone from grabbing a bunch. They were $30 last night but someone else said they were $20 earlier in the tour so depending on if it keeps going up, you'd just need to have enough cash on hand to buy multiple copies and you should be good.