This builds upon the deal posted by niloc225
The buy 2 for $39.99 and get a $20 gift card deal uses the full retail price to issue the gift card.
My local Target had a bunch of Wii games on clearance, like Guitar Hero: Van Halen for $24.99! I bought two of them for $50, and received the $20 gift card. I then returned the extra copy for $14.99 (they discount the return), so I'm only in for $34.99 at this point. I spent the $20 gift card on groceries I would have purchased anyway... net $14.99 game!
It should work for any clearance game over $39.99 regular price.
Sorry for the duplicate, but nobody would have seen it as just a comment on a two-day-old post: