Envision has released one of the cheapest 24" LCD displays - their new Envision G416 display is available for only $399! Pretty cheap but you might want to wait for some reviews first as the quality of these low-cost LCD displays isn't always impressive.
The G416 features HDCP supported Digital Visual Interface (DVI) input
enabling crystal-clear video playback from a variety of high-definition (HD
720p/1080i) program sources, including HD-DVD, Blu-ray DVD, Cable,
Satellite and other Set Top Boxes equipped with DVI-HDCP or HDMI using a
separate HDMI- DVI adapter.
The TFT active-matrix widescreen monitor offers 1920X1200 screen
resolution for exceptional clarity and a speedy 5ms response time that
ensures clear, uninterrupted presentation of rapidly moving objects and
fast-motion video. Boasting 3000:1 dynamic contrast ratio, the Envision
G416 provides vivid, true-to-life image quality and features Dynamic Color
Boost (DCB) with five options for the most natural color reproduction. Eco
Mode settings allow the user to regulate power consumption with a choice of
Text, Internet, Game, Movie and Sports settings.