Many sites, including Amazon.com (and, apparently, Tower Books), put up their product description with Paizo's mock-up covers and never change the picture to match the actual product when it's released. The Keep flip-mat is here. The image shown on the mock-up cover, however, is a dungeon from Pathfinder #1—Rise of the Runelords Chapter 1: "Burnt Offerings" and is not available as a flip mat.