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When Amazon sold out of Kindle e-book readers after just a few days, I was skeptical: they'd never announced how many were available in that first production run. Was it 100? 1000? A million?Now, we've got the same situation with Roku's new $99 set-top box that delivers "Watch It Now" streaming movies from Netflix: they're sold out, according to the San Jose Mercury News, but no one will say just how many were available.So does it matter that Roku is "sold out" of its set-top box? Or is this just a PR gambit to make the device seem "hot"?(Or maybe it's a manufacturing snafu: Roku says it'll take six to eight weeks to clear up the backlog, according to the Silicon Valley Business Journal.)