How can I find the value of an old apple monitor?

Need a faster answer?
Jeff's answer about eBay is correct, but I might be able to save you some time. Unless your old Apple monitor is a Thunderbolt Display or the 27-inch LED Cinema Display, it's worth nothing.

These teo models can be identified by the connector, which is a Thinderbolt connector for the Thunderbolt Display, and the Mini DisplayPort for the LED Cinema. (These connectors are identical in shape.)

These two models look very similar; one way to tell them apart is that the Thunderbolt Display has an Ethernet port on the back, but the LCD Cinema does not.
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