Should we have a thread about buy reports (discussing what stores had it, when, how many)? I didn't see any for this (though I didn't click all the threads - I have to work and can't finish the book today, and I don't want to see spoilers), and I think I remember reading before how this can be useful information.
So -- I bought my copy at Barnes and Noble in La Jolla (San Diego).
I went into the store and checked and didn't see it in the SF/F new releases, and so I asked a store clerk about it. Turns out that HoA wasn't on the SF/F shelf because it was on the overall new release table, right at the front of the store (first table in). It was a very nice placement (except that it was on the back side of the table, so it was a little bit hidden behind the other books on the table).
Also, when we asked about HoA, the clerk volunteered (we didn't even ask this) that they had already sold another copy earlier in the day (and it was barely noon). There were three left at the time (two, after I bought mine). So that's probably a good sign, maybe that store will sell out and reorder.
(Also, the SF/F section there had a solid EUOL section in general, paperbacks of Elantris and MB1 & 2.)