My mom is really good at it. Our church has an AWANA program. The children learn Bible verses, do relay-race kind of games and learn a Bible lesson. By reciting their memory verses, they earn "AWANA bucks" to spend at the "store", held four times yearly. My mom is in charge of store, and buys all the things to sell. It's a really big event. A lot better than it was back when I was in AWANA before she was in charge.
She has everything well-organized with the different prices things sell for, and is very good at making everything run smoothly. It's hilarious to watch adults gape over it like, "Our old church had AWANA store, and it was just a heap of toys with price tags stuck on them! This is great! You have it organized by price, and even have sales prices for things that are unpopular!"
Have you seen this youtube video? It's an Up remix thingy, and I think it's hilarious...