Realistically 700-1300$, depending on caliber and condition. Most expensive will be the ones in .30-06 (i.e. Belgium, Luxemburg, Columbia), least expensive will usually be the Egyptian (8mm Mauser) and Venezuelan (7mm Mauser). The Venezuelan ones tend to be in VG+ condition, and the others vary a bit more. This is definitely a reload recommended gun, I had some serious issues trying to get my 7mm Mauser one working with commercial ammo, and just sold it off rather than get playing around with it.
The most common ones you will see are the Egyptian ones, usually with the Venezuelan ones being next most common (even though the Venezuelan contract was one of the smallest). Very few pop up in .30-06 as everyone tends to like the caliber. Hope this helps.