Amazon offers the ViewSonic 3D-Ready 1080p DLP Home Theater Projector, model no. PJD7822HDL, for $479.99 with free shipping. That's the lowest total price we could find by $100. Features include a 1920x1080 (1080p) native resolution, 3,200 lumens brightness, and two HDMI inputs.
Note: It is temporarily out of stock but can still be ordered at this price and shipped when available.