If you type "dell coupon" into the US ebay, you will get a ton of sellers with 20% off coupons. I'm not sure how they get these coupons, but it doesn't appear to be a scam because a lot of deal forums use these "ebay coupons" to make deals sweeter. I don't know if you can use the US coupons in the UK store, but here's a link to the US coupon auctions. From what I hear, most coupons are delivered in under an hour.