Update 6.30.11: This deal is back for another go! We've updated the links to reflect the new listing, so grab it while it's hot.
The deal is for the larger 32GB version and brings the price down from $599.99 to $499.99.
According to the countdown, it will last for another 4.5 hours or so, which means the tablet will be available at a discount until about 1 p.m. PT. Shipping is free within the U.S. - other countries do not seem to be included in this deal. Update x2: The original sale ended, but the item was relisted (I've updated the links here) and is still available. I wonder if they'll keep doing it all day today.
If you've been waiting to grab yourself what is essentially the original Nexus tablet with all the ports one can fancy (MicroSD, MicroUSB, HDMI), then hurry up and pick up this bad boy before it disappears into the ether of regular priced merchandise.