We hope your heart wasn’t set on snagging a Kindle Touch before heading off to school this fall. Both the WiFi and 3G versions of the reader are no longer available as new devices from Amazon’s US pages — if you want one at all in the country, you’ll have to swing past a retail store or scour the virtual bargain bins for used models. Suffice it to say that the timing of this vanishing act is extremely convenient in light of Amazon’s special event next week, although just what it means is very much an unknown. Is there a light-up sequel on its way? A winnowing of the e-reader line to fewer models? Or just a quick inventory check? We’ll have a better answer on September 6th, but the out-of-stock notice is a not-so-friendly reminder that patience is a virtue.