First you need to make an account at ibotta. It is an app on both the App store and Google Play. ibotta helps you earn rebates to products at grocery stores and some online retailers!!
Once you have an account on ibotta, click "rebates" on the bottom left corner. Then select "Health & Beauty" and then "Birchbox.com". Select the picture that says Birchbox Monthly Subscription (the $10.00 one). Then you need to select "take a poll" and "learn a fact".
Then click the little pink shopping cart on the bottom row and then select send link. Check your email for your redemption link and purchase your Birchbox. Don't forget to use code BBJETBLUE to get an extra 100 points ($10) to spend at the Birchbox store.
This whole process took me less then ten minutes. Leave a comment if you try it, or if you need any help!