I've taken to using http://couponfollow.com/checkout http://couponfollow.com/checkout (the chrome extension). It helpfully colors the coupon code box red if it

I've taken to using http://couponfollow.com/checkout http://couponfollow.com/checkout (the chrome extension). It helpfully colors the coupon code box red if it has a suggested coupon code. Eventually, I suppose, everyone will move to one-time coupon codes. But that will probably take years, so in the meantime, I save money.