There are tons of beauty deals on Amazon to shop for. I like this deal for an Eos overnight lip mask. It's priced at $5.97, but you'll get a good deal when you clip the Amazon coupon for 20% off.
Then check out with Subscribe & Save for 5% or 15% off. Your first order will get a minimum discount and when you have five or more subscriptions shipped to the same address, you'll get the maximum discount. If your account qualifies for the maximum 15% discount, you could pay as little as $3.88 for one lip mask.