my faves are:
eluxury.com~for window shopping (mostly! their sales can rock though)
yoox~for window shopping
purple skirt~for inspiration
ebay~for real shopping
kultic~for real shopping
willow506~ for real shopping
neiman marcus~for real shopping (their sales can rock too!)
bluefly~for real shopping
I'm always looking for a GREAT deal (read: challenge) so gals ... have any secret sources?