I don't have any current discount codes, but if you sign up at Ulta.com they have 20% off anything coupons every few months or so if you're an active rewards member. (You have to watch these, though, because most of the coupons they send out don't work for the "prestige" cosmetics.)
I've also seen Sephora send out 20% off anything coupons to their rewards members, but it happens a lot less with them.