I'm still getting an astonishing number of questions of where I got my Hero Factory sets in the US, even though YouTube user after Blogger poster has answered the question. I hope this post here closes the cycle once & for all.
In the US as of the time of this post, Lego Hero Factory sets are available at many Toys R Us stores. Some stores get them sooner than others. Within the next week or so, all of them should have them. Where I got mine, though, was on the Toys R Us website. Here are links to each set: