I'm sure you know all about the box subscription websites out there. If not, here's the deal. There are tons of companies that let you sign up to get a box full of stuff based on your interests every month (or in some cases every few months). There are box subscription services for pretty much every interest out there. One of my favorites is Birchbox which sends you beauty and hair care products.      At $10 a month, it's a pretty good deal. Each box comes with about four or five samples based on…