An Israeli Mauser in 7.62 NATO, with a decent bore and decent wood should be around $500-800. I think there are some fairly sound reasons for their popularity: a. 7.62 NATO or .308W is fairly easy to come by; b. historical factor; c. some are rather nice rifles. I currently am housing four at my place, all good shooters. I sold a nice one a couple of years back at the Calgary show to a young fellow who was so happy to find one. I felt guilty for having sold it, so managed to find a nice one at the Brandon show a year ago.
They may not be all matching, pristine Berlin built K98's from Hitler's personal SS unit, but they are still quite collectable, especially in the eyes of some of the younger people who are raising families and paying for housing, etc.