This is from the circular. It says save up to 50% on selected titles, titles vary by store. At the CompUSA I went to they just had all games within the price range on sale. SWEET!

$29.99 titles NOW $19.99
$19.99 titles NOW $14.99
$14.99 titles now $9.99
$9.99 titles now $4.99

Not sure if you can price match this at Best Buy, but if so you will be getting $30 games for 14.99 after the gift cert coupon trick.