Boo. I call foul play on their timer mechanism. I suspect that their was a minor inconsistency across browsers or via the calculation from when you loaded the page. I purposefully had that page up for several hours, and watched it count down. It went from 0 directly to the Sold Out button appearing. Didn't even see the add to cart, even for a split second. I was ready to click the instant my timer ran down. In theory (get it, in THEORY?) that button should have at minimum appeared for all users at the same time, even if you only had a moment to click it.
It's not like I'm going to sue or anything, and I'll just buy a deck in a couple weeks, but as a professional web developer I'm kind of disappointed that their mechanism obviously did not work perfectly consistently for all viewers.