As was already pointed out you can purchase online.
You also can probably just ask.the cashier if you can purchase whatever items anytime you are in the building.
Sometimes even though I always decline because I don't want evidence. If you spend enough on a party they will comp you a T-shirt, hat, or whatever. You just have to ask before you leave. I was offered a shirt, or hat many times, but had to decline because I didn't want any evidence.😉
