Shoebuy.com is the largest online show retailer with over 700,000 items from top brands. I've purchased from them on several occassions, and have always been more than happy with my experience. Unlike many other companies, they don't charge you shipping if you need to return an item, and you can stack coupon codes! They always have a large selection of sale priced items, but you have to catch them when they go on sale, because Shoebuy.com's low prices don't allow for sale items to stay in stock for very long.
Right now, you can earn 10% off AND get FREE shipping. Don't forget to go through Ebates and earn an additional 10% cash back!