I caught them on the last road trip to North Dakota/Minnesota we were on. Back late August or early September, whenever it was. Checked in at 3 Walmarts and all had the big ole display with the GH's and OTC figs. The bins were full, so it must have been about when they arrived. I did pick up the Vader one for much the usual reasons - nostalgia. Could easily get a vintage one but I thought these were well packaged, two quaint figures and no risk of getting a piece of crap from an unscrupulous ebay seller. Plus I actually got to see it in person before buying it, a fair rarity for me.
Unlike Scott's armpits, the Walmarts in Fargo/Moorhead/Grand Forks aren't all that awful, they're pretty standard. That means I hate setting foot in them, but they are more like a boil on Matt's ass than an armpit kind of thing. I also found a Vader and Yoda VOTC in them, so I had little to complain about really. Target is much preferred, of course.