For this sort of vehicle price depends entirely on condition, unless there is something special about it (such as previous owner, first of, last of etc), and it is very difficult to even guess on the information you give. The GFC also makes any prices very uncertain.
Having given this preamble, let's think about it. 
Minimum price is set by scrap value, and this is perhaps as high as $500. If the panels are straight, parts value can be higher, maybe $750. 
As a going vehicle, the problem is it is not going. You have to determine how close to going it is. If it has been standing in the open for that long, you can assume at least four new tyres, a net battery and overhaul brake hydraulics. 
Beyond that the critical things are rust and engine. If the engine turns - should have a crankhandle - there is a reasonable chance it won't take major wallet surgery.
Rust - the key areas are the bulkhead, particularly round the vents, and the chassis - look particularly at the rear crossmember and outriggers where mud off the wheels hit and accumulate, particularly the hole in the outrigger where the pedal pushrods go. 
If the engine will not turn or there is enough rust to penetrate either the bulkhead or chassis, you are looking at a lot of work and expense - no more than $500 in my view. 
If this checks out OK, look for other significant expense items like a rusted out or bodged exhaust, bodged wiring, upholstery that needs replacing. Take the lid off the fuel tank under the driver's seat, pull the filler tube out (a slight turn allows it to be fully removed) and have a look with a torch. Look for more than 50mm play on the steering wheel. Jack up each front wheel and check for being able to rock it vertically (should be no movement, but less than 5mm at the tyre tread is acceptable.
If there are no problems from these checks, it could be worth as much as $1200, perhaps even $1500. Deduct from these figures guesses of costs to rectify the sort  of problem in the last paragraph. Remember that it will be worth no more than perhaps $3000 (probably even less) running, registered, and unrestored, and you probably have missed something that may be expensive!
Hope this helps! The more examination you can do before making an offer (even to the extent of supplying a battery and fuel and see what works) the less uncertainty you have.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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