As long as you have the receipt, you're good. Check your receipt to see which one you paid full price for and which was 50% off. You can return the items for what you paid for them. It is really weird, because they sometimes have deals like buy two, get one free and if you give someone the free item with a gift receipt, they will tell them that the item has no value. (yes, that happened to me and my SIL with Fisher Price items last year) BUT, on the flip side, you can technically return the full price item and keep the one you paid 50% for. I don't know why they don't spread the savings over all the items, but they don't. And yes, technically it works the same for the buy two, get one free things (meaning you could return the two you paid for for full value and keep the free one). I'm guessing they'd catch on eventually if you returned a ton of stuff, but I find it weird how they do those sales because they leave a pretty big loophole.