I used a $10 off $10 coupon to purchase an item. First I tried to use the coupon on an item that cost $15, but because it was a sale item they would not take it. So I went back and selected a $20 item instead. Unfortunately the item which was a "jump drive" did not work. I tried downloading drivers. I tried different ports. Nothing worked so I had to return it. So I'm thinking I could exchange for another $20 item, but instead they gave me back the $10 I paid and I lost 100% of the value of the coupon. I'm sorry, but that's a bit shady. I feel like I wasted my time. I'll go to Fry's instead next time.