Whenever you make offers on anything, you should start out lower than you might be finally willing to spend. Starting out at $500 for the both is fine and if you really want the F-2000 then my guess of $500 for the both is right in there with Johns guess of $500 for the wall cutter as he feels the mat cutter is too old to be worth much as there are newer,better models out there. Telling the person that the F-2000 is sooo old, it's not worth much of anything. Finally, offer him a couple hundred or less for the cutter.
Besides... good working condition as compared to what?