The value depends on if you are left or right handed.

I would say LH is more expensive new because it will need to be special ordered. If the dealer has had a gun in stock for a while there is pressure for him top sell it so he could lower the price.

Used LH guns are harder to sell because only 10% of shooters are left handed and some shoot righty. I know of a few nice Weatherby MK Vs sitting with a good price because no one wants them.