Auctions give you the opportunity to bid on a particular item. Each item on auction carries an allotted auction time. The highest bid at the end of the auction time will be rewarded the item.
Sweepstakes gives the customer the opportunity to use rewards to purchase a change to win a contest. Each entry will carry a point value.
CB Shop gives you the opportunity to use rewards to purchase an item. Reward points used for an item are deduced from your account in exchange for the item.