$599 $999
Horizon Fitness has the Horizon Fitness T101 Treadmill for $649 - $50 off with coupon code LETSGO [Exp 12/15] = $599 with free shipping. Highly reviewed model has integrated Bluetooth speakers, device holder and rapid-charge USB port.
Their other Go Series Treadmills (T202, T303) are also $50 off with the same code.