You should always keep an eye on the instructions provided on the AppGrooves page. Even though our coupons are always fresh (and we promptly remove those that aren't), certain deals will come with some fairly unique conditions of redemption. For example, B&N won't allow coupon stacking (combining deals) and some codes may only work if you're in the US. If your coupon of choice won't work, remember there are always many others on AppGrooves to choose from.