Looking to buy 02-07 TRX250

So I have been looking to buy a used 02-07 TRX250 and I am curious about what is a good deal. I have seen everything from $500 to $1800 with most of them priced near $1,200. On the low end, $500, they are not currently running and claim the bike only needs a couple of things like carb and battery.
I was wondering if these prices are about right since the only blue book values I can find are closer to $650 to $1,000. Let me know what you think or any recent ones you have seen for sale and what they are asking.

Thanks