MSRP on the frame is $420, and they can be found new for $400.

The Surly "build up" of this bike is $930 MSRP and can be had for $900 new.

The components on the stock build up are:
100% Surly 4130 chromoly steel frame and fork, with butted main triangle tubes and a nice lugged/brazed fork
Ritchey Logic Comp threadless headset
Kalloy 1 1/8" threadless stem
Zoom aluminum handlebars with cork wrap
Tektro R200A levers and Oryx cantilever brakes for powerful braking under load
Shimano 9speed bar-end shifters
Shimano Tiagra front derailleur, Shimano XT rear
Sugino XD600 triple crank with 26/36/48 rings, Shimano UN53 bottom bracket
Pedals not included
Kalloy seatpost with Surly constrictor clamp
Velo Endzone saddle
Wide-range Deore cassette with 11-34 teeth
Alex Adventurer 36h rims, laced to Shimano XT hubs with sturdy 14G DT Swiss stainless spokes
WTB Slickasaurus tires with presta tubes

For a Surly build with that many miles, I would probably pay up to about $700. However, it has different bars, and may have different components. The cost for a Crosscheck is similar, and I paid just under a thousand for mine on ebay slightly used. HOWEVER, it had better cranks, shifters, derailleurs, wheels, a generator hub, bars, etc...It was at least a $1500 build up.