Sorry for the post spamming but this really got me thinking:
You know those mats that vendors have at GPs where they sort your cards by $1, $5, etc when buying a collection?
SO if you got a pack, then one player sorts the pack onto this kind of mat, and so there's some $1 cards, some $5 cards, etc, and then the other players get to buy the cards off the mat, and then the next guy becomes the dealer for the next pack, and you continue until you have the requisite number of cards for decks.
Rough sketch of gameplay:
Each player starts with something like $20 per pack (except the dealer for the round), and cards can have values of $1, $5, $10, $20 and maybe something else in between. There can be 1 card worth $20, 2 cards worth $10, 3 cards worth $5 and the rest worth $1. Player 1 deals out the pack and players take turns buying the cards out of the packs until nobody wants to make a purchase form the pack. Then player 2 becomes the vendor, the other players get their $20 "go" money for the pack, and you repeat. Money should roll over to the next pack. If two players want the same card, might as well auction it off or something.
Bust out your Monopoly monies boys, this one sounds fun!