What are your experiences with these warehouse clubs? I've used cakes and frosting from Sam's, but I'm curious about Costco's offerings. What do you recommend?

GFS is fantastic, and it angers me they aren't in Georgia. The only thing I've used from Sam's is the tub of frosting, which is pretty decent, and you can buy cases of un-iced cakes. It sounds like Costco has similar actions. GFS is king.