Dunno....the last one I picked up was the 1907 Model F last year - was very tempted to ditch the Model 607 for it but could not face another mechanical restoration. There have been some nice cars auctioned in the US recently though, and even with the rise in prices I thought one at least might have come over here.
The supply of steam cars in North America has been greatly diminished. Not only were they greatly exported to the UK, but they were also exported to the rest of the world too. There are still many steam cars left in North America, but presently they are not as easily found, nor are they as easily found available for sale. I remember back about 20 years ago when junk steam cars were still being found in the back woods for almost free, the only cost being, was just the cost of hauling the car or pieces of it home. They were the rare occasions, but I had seen it happen. The donor Stanley for my 1911 Model 85's rear axle, I found hanging on a canyon wall south of Lewiston, Idaho. Been there, done that.