Armalite has them on their web site for $1742. My guess is that a new one in today's open market - if one could be found - will be at least that and probably more. A used one in good condition will probably also be close to that number. My buddy has a gun shop in Mankato, MN - he spends alot of his time trying to locate Ar's for people. It's nuts what is going on with AR pricing. I bought 7 between last spring and late summer. Mostly Colt LE models. They have appreciated on average 30% in value since then.
If your buying get whatever high-cap mags you think you will need. If selling I would wait as long as you can. Unfortunately as long as the dem's are in charge they are going to do nothing but increase in cost.