MegaMacs offers the used Apple 17" Studio Display LCD Monitor
(pictured), model no. M7649ZM/B, for $34.99
plus around $14
for shipping. That's $5 under last month's mention and $9 below the lowest total price we could find for a used unit elsewhere. It features a native resolution of 1280x1024, two USB ports, and Apple ADC video input.
Note: Unless you have an older Mac with ADC output, you'll need a DVI to ADC adapter to use this monitor. No warranty information is provided.