Today on HauteLook.com they're offering a $40 E-gift certificate to BeautyBar.com for just $20! Woo-Hoo!
They also offer free shipping on tons of products and with every $39 worth of products, you get free shipping as well.
Every order comes with 3 free samples and I heard a lot of people rave about how fast they received their order (some even next day!)
BeautyBar.com is sort of new and the brands they're carrying is still growing, but eventually I think they'll be like Sephora and Ulta. They carry collections from Philosophy, Bliss, Stila, Fekkai, Clarisonic, Korres, and many, many more. Go check it out!
PS - Ebates.com offers 1-5% cashback for your purchase as well!