First sightings on ebay mean some stores are starting to release them(or some people got lucky). Fireteam Osiris took 3 weeks before amazon had it in stock, etc. when we had them first pop up. But so far the social norm is when its spotted on ebay it will on shelf release comes not long after.
As of posting this Skeletor, He-man and the Xenomorph alien have been sighted in ebay from Arizona, chances are to say we should be seeing them be more locally in shelves sooner than I originally thought.