e.l.f. cosmetics is currently running a FREE $10 gift card when you spend $20 or more promotion (valid now through 12/25). This is an awesome deal as you are receiving half the amount you spend for FREE. Enter code GC10 at checkout.
If you don't want to spend $20, you can also save 50% off studio line with code Ecd21.
Last but not least, if you don't care about either of the offers above and rather just get FREE shipping with your purchase, enter code SHIP25 at checkout for FREE shipping on orders $25 or more.