There's an Amazon global store at https://www.amazon.co.uk/b?ie=UTF8&node=11125348031 which allows you to buy products directly from the US. Books, clothes, DVDs, luggage, shoes and bags. Delivery can be as little as 2 days, and prices include all import duties and taxes. You can also return items and use UK customer service. I haven't tried it yet myself, but it might be worth a quick look!