MAC Cosmetics (who have some extremely loyal users) has a great program that can merit you some free MAC lipstick of your choosing! Here is the exact wording off of their website:
“Because we share your commitment to the environment, M·A·C accepts returns of its primary packaging through the Back to M·A·C Program. By returning six  M·A·C primary packaging containers to a M·A·C counter or M·A·C Cosmetics online, you’ll receive a free M·A·C lipstick of your choice as our thanks to you.”
You can do this in the store or by mailing them in! For more information, check out the website.
Thanks Laura B for pointing this one out!