Another of these, 15% off, today only.  Promo code = EARTHDAY2012.

There was some confusion last time involving skeptics that wanted to
'verify' ...  Never mind internet rumors, you can do this for yourself.
Throw something you want (or something at random) into the cart, go
through the checkout process filling in the code, and watch them
calculate the discount.  If you don't like the result, empty the cart
and back out.  I've never seen a website that didn't let you cancel,
right up to that last click.

On the list of stuff I ordered, the 15% applied to everything except
items that were already on a monthly special.