I saw one in a Best Buy today. But it was just sitting by itself in a display case while a screen above played a promotional video, since, if I recall correctly, GameStop has some kind of exclusivity deal for actual store demos.

The console itself is actually larger than I thought it was. Instead, it was the small size of the controller that surprised me. Even though I've seen plenty of photographs and videos of people holding it, actually seeing it right in front of me was a revelation.