Nashbar offers the Diamondback Overdrive Sport Mountain Bike for $549.99. The price drops in-cart to $412.49. With $14.99 for shipping, that's the lowest total price we could find by $55. It's available in 16" to 22" sizes and features a SR Suntour XCT-LO 29 suspension fork, SR Suntour XCR SIX crankset, and Shimano derailleurs.