How much should I pay for a Optiquest Q9 flat screen monitor?

We recently got new monitors at work so we left a few Optiquest q9 on flat screen monitors sitting around. I want to make an offer to buy one, but I'm not sure how much it's worth. The monitor is about 1 1 / 2 years and I think are about $ 170 new.

Resources are available on the Web to help you determine the approximate value of equipment used. These resources include: Amazon.com eBay Computerpricing.com Pricewatch Used Equipment Exchange These web sites may provide a general idea of what was a similar unit sold a. If cleaned regularly, and look in decent shape, you must provide over $ 75 to $ 90 as the price, and verify that it receives, not "Dead Pixels" You can get a dead pixel tester here: http://majorgeeks.com/Dead_Pixel_Tester_d4806.html JC

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