Just make sure you are ready to buy if you sign up for the emails. I got mine and in very small print it says that it must be used with in one week of receiving the email
Normally if you leave a review on one of their items, they will email you a $5 coupon in a day or two. That has happen to me every time I've done it, so every time I'm about to buy something I do that.
As was noted above, if you sign up for their emails, you get a 10% code via email. Did that today and applied it right away to an item that was already discounted.