Adorama offers the Ikan VXF7 7" HDMI/SDI On-Camera Monitor for $399 with free shipping. That's the lowest price we could find by $251, outside of the mention below. Deal ends October 30. Features include:

1920x1200 LCD panel

4K video support via HDMI

SDI to HDMI signal conversion

1:1 pixel-to-pixel mapping

DSLR scaling

A close price: B&H Photo Video has it for $399.99 with free shipping. This deal ends today.