Has he been found before? Just found one along with Dark Sentinel Prime. Sorry if I'm wrong. I tend to miss things even with a search.
Dunno. This past month and a half I've been to Targets, but never have seen him there. Although, you may find it in TRU or Kmart.
Walmart in Harlingen, Texas. Didn't we just front page a review of Reverb? I'm not sure about Dark Sentinel though, I've seen nothing on him.
Cool - I want it! There was a review of Reverb on the front page from fxfranz, who is in the Philippines, I think. This would be the first reported US retail sighting as far as I know. And I don't recall anyone reporting finding Dark Sentinel Prime, but I've seen plenty of sightings of Guzzle - I think those two are so far only shipping in one case, and they share the same one.