Free sample of o.b. tampons
Getting the freebie sample means you agree to get e-mails from o.b. in the future, but you can always unsubscribe if you don't enjoy them. If share all that personal info is too much for you, get coupons for o.b. products instead (or in addition to).
If you've never used o.b. tampons, they are super compact because they don't require an applicator, which means less packaging and waste. The freebie site says o.b. tampons have 58% less waste than applicator brands, which makes this freebie a very "green" one. Today is Earth Day, afterall.