Seems like I always buy at least one of these at every York. The first thing I look for is the amount of paint missing on the figures. On the 3370 cars, I now just buy them based on the condition of the two figures. Even some cars that look LN+ have paint missing on the figures. I bought two of then 3370 cars this year. One postwar that was virtually mint except for rust on all of the metal surfaces. I will swap out the body and figures for a car I have without rust. The other was a 3370 postwar celebration version which I had never seen for sale at York.
There are also a number of varieties now. I have one from the Kids Club of Rocky Mtn TCA, a orange and black one, and I especially like the one from the Lone Ranger set.