I've gone back and forth on if these things are really relevant, but seeing them posted on Toys N Bricks made me reconsider.
There are two LEGO Star Wars alarm clocks shaped like Darth Vader and Stormtrooper minifigs now appearing in US and Canadian retail stores. The dimensions appear to be similar to what I would envision a 'maxifig' would look like, a larger scale version of a minifig. If you can get past the clock display, then this is the closest you would be able to get (assuming you can't get your hands on one of those Target displays).
These are priced at $29.99 USD and appear to have articulation in the arms and legs. FBTB.net also states that the heads light up and serve double duty as the 'snooze' button. No word on if these will be available outside of North America.