And it's especially true for the days following Christmas, when retailers slash prices and announce massive end-of-year sales for cult brands — Kylie Cosmetics included. From now until December 28, Kylie fanatics can enjoy up to 40% off Lip Kits, limited-edition eye shadow palettes, brushes and more. When you spend over $100, you can also get a makeup bag as a perk for spending your holiday cash. What more could a girl lounging around in pajamas ask for?