look into any transportation companies nearby or limo services. They often have minivans with high mileage but they are well taken care of. I myself have a 2010 RAM with 205k miles on it now and nobody would ever want to buy it from me if they knew the mileage, but if they saw it they would be all over it. I take meticulous care just because when I bought it new in 2010 $33,000 was a ton of money for me to think about spending on a new truck. Glad I bought it when I did, I can't get over the prices of new ones. But if my engine blows or tranny goes, I will invest in new ones cause it will still be a lot cheaper than replacing with new.
How is the rust situation in WA for cars usually? Mass highways used salt brine quite liberally so rust is always an issue with used cars here. I'm personally more concerned with rust than miles usually.