I saw that, but as Skywarp91 mentioned, that's when you redeem it, not when you earn it (which was my question - so that I know just how much in total you end up having to spend to save a mere $10).
As someone else noted, the 20% off deal was much better, as $10 off $100+ spend is pretty insignificant when you are paying TRU prices.
(edit - posted after the two preceeding posts were done)