Diablo III coffee mugs.
This set of four coffee mugs was revealed on September 17, 2011, to be sold exclusively at Blizzcon 2011, to show attendees and virtual ticket subscribers.
The mugs cost $22. There are four mugs with images from each of Blizzard's games on them. The Skeleton King is the only one with a Diablo design.
The official production description:
"Make sure there is no question around the water cooler what game you play. This set of mugs comes complete with Garrosh Hellscream, Varian Wrynn, The Queen of Blades, and the Skeleton King."