Amazon offers the Diamondback Men's 2013 Overdrive V 29er 18" Mountain Bike
in Black for $250.90
with free shipping
. That's $156 under our June mention (which featured disc brakes) and the lowest total price we could find now by $174. Sales tax is added where applicable. It features 29" wheels, 6061-T6 aluminum tubing, a SR Suntour XCT 29 fork, Shimano rear derailleur with 7-speed RapidFire shifters, alloy linear-pull brakes, and more.
Of note, it's also available in 20" for $254.81 with free shipping.