PlayStation Blog regarding Ratchet & Clank Future: Tools of Destruction. Due to manufacturer's expediency, the game started arriving in stores early and instead of getting angry and Hulk smashing everything, Sony's given retailers the green light to start selling the game next week. However, it's not yet known what stores will be selling it before the "official" October 30th release date.
This situation currently remains YMMV (Your Mileage May Vary) given there's no list of stores, public anyway, who've received a slice of the Future early. However, expect fellow gamers to post tales of receipt on every forum they post on, which while annoying should aid you in your quest. Good morning, and good luck.