MNW Global via Newegg offers the Wasabi-Mango 42" 4K AH-IPS LCD Monitor, model no. UHD420, for $679. Apply coupon code "VCO2015BTS" and check out via VisaCheckout to cut it to $654. With free shipping, that's the lowest total price we could find by $15. It features a 3840x2160 native resolution, speakers, three HDMI inputs, DisplayPort, 110~240-volt free voltage adapter, US plug adapter, and LG LED backlight. Deal ends August 31.

Note: This is an SE grade model and could have some defective pixels on the panel. (0 to 15 pixels are allowed.)