Walgreens has Select Olay products on a Buy 2 Get 1 Free plus some items have a digital coupon (or you can get it from their coupon book in store).
Make sure you're signed up as a Walgreens Balance Rewards member and their Beauty Enthusiast member (think you need their app for this) and you'll earn 50 points for every $1 spent plus 5000 bonus points (that's $5 Walgreens cash you can use on your next visit) when you spend $50+ on beauty products which you're likely to do with just paying for 2 good Olay products.
And Walgreens is also doing their Jingle Cash right now. So when you spend $50+ you’ll get a $10 coupon to use on your next trip but only during the specify dates on the coupon. So pay attention to those dates.
Pair this with Ibotta cashback and the P&G rebate and you'll really save on some great skincare products!