Right now ShopAtHome has a bunch of double cash-back deals for Earth Day from some great companies. Check out the list HERE.
Gaiam is on the list with 12% cash-back. If you sign up for their email list, you get a coupon for 15% off. So you can get an order with 27% savings if you combine these!! But remember, you have to click through ShopAtHome first to get the cash-back!