Marin Muirwoods 29er Bike for $499.93.  This bike will ship for free to any REI store and is only available for in-store pickup.  Here is a screenshot for your reference.  The Muirwoods frame is made of double-butted chromoly for strength and vertical flex, and features seatstays and chainstays designed for vertical stiffness.  It also features Shimano components and Alloy 3 disc brakes.  The bike is only available with a 20.5" frame.  Most places sell this bike for about $599.