MegaMacs offers the used Apple 17" Studio Display LCD Monitor, model no. M7649ZM/B (pictured), for $39.99 plus around $14 for shipping. That's $4 under the lowest total price we could find for a used unit elsewhere. (For further comparison, it's $132 under the lowest total price we could find for a refurb.) It features a native resolution of 1280x1024, two USB ports, and Apple ADC video input. Note that unless you have an older Mac with ADC output, you'll need a DVI to ADC adapter to use this monitor. Deal ends December 12.

MegaMacs also offers the used Apple 20" Studio Display LCD Monitor, model no. M8893ZM/A, for $59.99 plus around $17 for shipping. That's $355 under the lowest total in-stock price we could find for a refurb. It features a native resolution of 1680x1050. It'll also require an adapter if you plan on using it with anything other than a Mac with ADC output.

Of note, no warranty information is provided for either monitor.