Get up to 80% off at Sephora's sale section with prices as low as $1. You should also check out their weekly specials for extra deals. You could also use the code "YOURGIFT" to get free deluxe samples with your purchase. Shipping is free for orders worth $50 or more, and customers get free samples with every purchase.
VIB members can also use the code "V436CB" to get a 10% discount.