Alert: Some buyers have been overpaying for single hot packs of 2012-13 Upper Deck Artifacts hockey. Some sellers 
have been taking advantage of the fact that this years set has no single jersey cards. Those sellers have been leading buyers into thinking that their "guaranteed dual jersey" packs are "rare."
I've seen buyers pay as much as $18.04 (excluding shipping) for a single pack of this series. I suggest researching a series before you make a purchase...
In an interesting related note, I just noticed that Upper Deck put less memorabilia cards in their blaster box packs for this series. The odds of finding a memorabilia card in a retail blaster box is 1:80; meanwhile, the odds of finding a memorabilia card in a retail box is 1:72. The packs in both of those boxes contains 5 cards. That's a pretty shady move!