GiltGroup is one of the "Flash Sale" sites that have sprung up over the last few years. They sell designer clothing for 30-50% of retail, and every few months they group together the stuff that didn't sell earlier and put it at a much deeper discount.
I got myself a pair of canvas summer sneakers during one of their standard sales for less than $20 not too long ago, and found the service to be entirely reasonable. The good stuff tends to go very quickly, especially during these extra-discounted sales, but you might find it worth a look.
If you need an invite, here's mine: http://www.giltman.com/invite/bkbjohnson