For its newsletter subscribers only, newegg offers the Dell S2230MX 21.5" 1080p LED-Backlit Widescreen LCD Monitor, model no. DWYC0, for $169.99. Coupon code "EMCNDHJ228" cuts it to $139.99. With free shipping that's $10 under our March mention and the lowest total price we could find by $17. This ultra-slim display features a 2" panel depth, 1920x1080 (1080p) native resolution, LED backlight, 1,000:1 native (8,000,000:1 dynamic) contrast ratio, 250 cd/m² brightness, 2ms response time, DVI-D and VGA inputs, and more. Coupon expires June 27.

Of note, Amazon also offers the same item for $139.99 with free shipping.