Best Buy via eBay offers the Dell 23" 1080p IPS LED-Backlit LCD Monitor, model no. S2316M, for $99.99 with free shipping. That's the lowest total price we could find by $22, although it was $25 less in November. It features a 1920x1080 (1080p) native resolution, LED backlight, and VGA and DVI-D inputs.
Don't mind an open-box unit? Best Buy via eBay has it for $88.99 with free shipping. A 1-year warranty is included, however it's unclear who backs it.