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Gilt Group is, according to that video i found on youtube, one of the fastest growing sites on the net. It features some of the greatest designers from the most luxurious department stores. The best part is, it is a fraction of the cost. They feature only a few designers at a time and they email you which ones are starting. For example today is Theory, for men. There's other stuff for women, but seeing as I am not part of that crowd, yeah.
The greatest deals i found were on Marc by Marc Jacobs, Rock and Republic, and True Religion. I've found the Gilt Group is about 50% or more off retail, sometimes more, sometimes a bit less. Most certainly a good deal.
It is apparently supposed to be invite or something, but i don't think that's how i did it (I think I clicked an ad), anyway, to be on the safe side, that's my "Tom Wing is inviting you" link in the sidebar.
Check it out, and enjoy!