Their Reward Certificate's are bestbuy monopoly money, the way it work's is you get 1 point per $1 spent normally (takes about 30 days to clear), and you can cash out your points at increments of 250 for a certificate (250=$5 500 =$10 etc) You dont get $20 exactly, you get a bonus 1000 point's added to the purchase of the game you preordered (select list of eligible games). The Certificates are like giftcard's, only good at BB and can be used on anything, a common practice is to use the $20 from a previous game on the next game you can get $20 from, therefore a infinite cycle of (select) $40 games day one.