B&H Photo Video offers the
Mul-T-Lock GotU+ 5140 Digital Door Viewer with Camera and Bell in Aluminum for
$89.95 with
free shipping. That's $26 off list and the lowest price we could find. The base unit features a 4.3" LCD screen, and the doorbell unit/camera features a 105° field of view, IR night vision, and motion detection. A 2GB microSD card is pre-installed.