Chances are if you read any beauty blogs, you've heard of Birchbox, but just in case you haven't, here's a quick description: it's an online beauty retailer that also offers a monthly subscription service. Every month Birchbox mails subscribers a small box of about five samples to try. You can earn points by reviewing the items you receive and then use those points toward purchasing full-size products. For more detailed information, check out the FAQ section on their website.