2012 Countdown Clock
There are lots of these online, but here we have a real clock that counts down to Dec 21, 2012 – or any other date you care to plug in to it. Regardless of dates, it will always feature the Aztec Sun Stone (yep, not Mayan, but the best visual representation of the Long Count calender we have):
Official site, which one day might tell you where to purchase, is Thumbs Up!
Additionally there are plenty of apps for your phone, like this one:
Or down in Tapachula, Mexico, there’s a giant clock:
And if that’s too big, consider a $10 keychain / conversation piece:



