It's happened twice to me now, as I move the mouse to the top of the screen after looking at the cart for a while, it pops up an offer for now only with a code for an additional 5% off.

Not sure what causes it to happen, perhaps its like hobbyking and you have to stare at the page for long enough and they think you are about to close it or something, but its worth it.

Also allows that and the free shipping code at the same time, and it took 5% off things already on sale for me.