I just picked up POP, Beyond Good and Evil, and Midtown Madness 3 for 32 and change after tax in Southern MN - Interesting thing is that they were showing up in the isle scanner - the guy scanned each one in the isle and it came up Geoffry, then 2 seconds later 50% promo.
When you used the card you would have gotten your original 5 dollars you put on it, plus the additional 5 dollars off with the coupon. Five dollars for free is always worth it in my opinion. You just go get another card if you want to use one again - you could have put one penny on the card...