check machinerytrader.com, ironplanet.com, equipmenttrader.com Bargins abound now. Have 45,000 I can get you a 2007 1044C-54 with very low hours
looks like new. Similar machine on fleabay went for 10,000= last week. They guy never told me the year until the last minute so I gave up on the bidding and assumed worst case it was a 1995 with no serial number. Foam & tires 800+ Calcium filled 600+
I would not pay much for a machine unless I personally knew the guy who owned it and he was good ay taking care of it. I agree with barklee on hours and price vs. money. Full tread is 1" + a tad but you can look on like to see tire specs.
Where did the machine come from? Private seller/owner, rental house, or reseller? Million things you should look at especially the boom to make sure it was not bent when over loaded. Listen carefully when it is operating to the boom and make sure it is smooth and no leaks.
You could get the fluids checked also. Check the planetaries, pull the hydraulic filter. Check wear pads & chains.
Auxillary hydraulic at end of boom or rotating carriage? Look for any cracks in the boom or frame. You cannot look to much and bring another set of eyes with you because when you buy it it's yours! Good Luck!
I checked ironplanet and there are 88 for sale in the next few weeks. You can look back a see what they sold for in previous auctions by make or years on ironplanet