I live in Oregon and it's the same way here when it comes to the cost of used 4th gen Dodges. Have you chatted with Dave Smith in Kellogg Idaho and Dennis Dillon in Boise? I was like you looking to buy a used one and found the price difference from those guys between a new one and one that is in good shape and a few years old wasnt that much. Also the 2018's will be cheaper with the 2019's coming out now. Dillon had the best price for mine
www.dennisdillonchryslerjeepdodge.com
If you are set on a used one, Texas is a great place to look but you'd have to plan on a few days down there to go look at them before you buy.
I’ve been meaning to check out Dave Smith actually, my uncle bought a new truck there and my best buddy just got a truck at Kendall. A couple of weeks ago I looked and they were not discounting the diesels much. HUGE discounts on the gas trucks though.