I sometimes regret not having taken advantage of a guy who really wanted to sell a 4516-2 in very good condition for $200 ... but I think he really only felt that way because it had some erratic extraction problems.
I saw his extractor was broken and fit a new one for him. I think he liked the gun again afterward.
I recently paid $520 OTD of a local gun shop for a very good 4516-2 with 3 magazines, double mag carrier, and a holster. Depending your area the price could be lower or higher, but I suspect it would be in that range of + or - $75.