As a sort-of follow up to yesterday, I did in fact go back to Target and snag another Stormtrooper. By that point, not three hours later, all the Chewies, Artoos, Landos, and Threepios had disappeared. Looks like I saw a magical moment in history that may in fact never be duplicated.
But I still got my second Stormtrooper, and gave Boba Fett another hard once-over before passing him up again. After having worried I'd never find one (as I've yet to see in person a SP Clone) I'm glad to have two of'em. Great stuff.
Oh, something else I've noticed--Chewie has no peg holes. Alas.