2006 Marin AXC Northside Trail, what's a fair price to pay used?

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http://www.marinbikes.com/bicycles_2006/html/bikes/bike_specs/specs_northside_trail.html

Includes Time clipless pedals and cateye computer. In good condition.

Need to know before this evening, going to possibly purchase, finally
moving up from el-cheapo bikes.

-Tom