I am not sure of the going prices in your area, but where I live (MA) a 318 with 350 hours (this is low) would bring about $2500-$3000 in good condition with the 48" deck.
Check the machine over to make sure there are no major problems with the engine, PS cylinder, seat, oil leaks, battery area, tires, etc. If it needs work in any of these areas this would reduce the price somewhat.
They are great tractors. What are they asking for it?
Ken /forums/images/graemlins/smile.gif