ok so i was shopping for a kriega backpack for my bike and found one at an online store. was going thru the checkout and they have a spot to enter a coupon if you have one. so i go search some more and find a coupon code for this site. put it in, it work saves me some money, and i checkout using paypal. get an email from the site saying thank you for your purchase and gives me the total i paid. ok im thinking alright, i make a good buy here. get another email back saying i need to pay the difference from the coupon because it doesnt apply to the backpack? has this happened to anyone here before? i say if the coupon works when you check out it works. is it my fault the site accepted the coupon?