I bought two but it only let me enter one code. It says "You've already entered today", so I said okay and decided I'd enter the next one tomorrow (today now). It still says the same thing. I guess there is a 24 hr timer or something I have to wait for...problem is I have no idea what time I entered yesterday lol. I got a $5 credit, but as I recall from a previous thread, those are practically given out like glowsticks at a rave party.