Searching for one of these trucks in pristine condition and spotless consistent service records is a challenging exercise, for sure. If you cast a wide distance net, you have to be willing to get there fast when they show up on the popular sites. Both of my 200s were purchased from "premium" dealerships, one a Land Rover, the other a BMW dealer. Both were recent trade-ins on new cars. I think the key is to be comfortable with the process, look how you are treated, and see how they react when you ask about putting it up on a rack to thoroughly check it out. When I bought my '11 from the Land Rover place, they were extremely helpful, they gave me full access to a bay and a lift, whatever I wanted. They let me test drive it for as long as I wanted. No pressure at all. Similar experience at the BMW place, although I couldn't get into a bay, they were too busy. They let me crawl under and do whatever I wanted.
I looked at a 200 at a Toyota dealership, they were very resistant to me poking around underneath. Wouldn't let me touch it with a wrench. It was in the shop getting new tires, and they wouldn't even lower it down enough so I could look inside. Will never set foot in that place again. Honestly, I've never been impressed with the service or sales at ANY Toyota dealership. I just had a great experience with the local Lexus dealer on our IS250C, I took it in only for an oil change since it was free, but they offered to do the entire 60K service for free ($850 of work) since the car is still Certified, and gave me a loaner.
My advice that I tell people when they are car shopping: get a "burner" email account, only give them that, and use it for registering on all the usual shopping sites. Set alerts, then check it once a day, morning is best, as the emails seem to always get sent out in the middle of the night. Never give out a phone number until you are ready to buy.
Good luck.
