Despite clicking the "Use my discount" button (email), the code didn't apply at checkout (I can neither confirm nor deny the possibility of operator error) & unfortunately, my finger hitting the SUBMIT button was faster than my eyes could communicate to my brain that the cost didn't math right. I reached out to customer service right away, explained my self-inflicted issue & they were kind enough to issue a refund of the % off pretty much immediately. Literally. It was in the bank that night.