In their gift section. The mugs are a set of four, featuring Boba Fett, Darth Vader, Luke Skywalker, and Han Solo--using the awesome cardback artwork from the Unleashed figures. (I think they come with some nasty fake hot chocolate mix, or something.)
The stein is rather small, but cool, and has character images wrapping around the entire body in roughly chronological order. It had some knockoff Hershey's Kisses, or some sort of candy that looked like knockoff Hershey's Kisses.
The mugs were $14.99, and the stein was $9.99. K-Mart usually runs a sale closer to Christmas where all these gift sets are half off, but I'm not sure these will last that long.