Paula's Choice has a code right now for 20% off their Clinical 1% Retinol treatment: AMRETINOL20, bringing it down to $44. If you are a new customer, you can also get an additional $10 off by using someone's invite link (here's mine), bringing it down again to $34. This shit isn't cheap, but I've had good results with it, and I'm still using it - no plans to stop (my review here). You also get 10 extra free samples (in addition to the usual 3) with your order right now, and shipping is free over $50.
J. Crew Factory has an extra 35% off most things (including clearance) today with code YOUWIN.
Some other stores are having 20-25% off sales right now too (which I don't consider especially exciting - just better than nothing): Too Faced with code BFF20, Beauty.com has 20% off almost everything (you have to use this link, or the one you got in your email if you're on their list, to add the discount to your cart, and it ends
Any other good deals you've come across lately that I missed here?