This seemed like such a good idea that I figured to give it a go. For someone just getting started in the hobby, hopefully this is a small start. All are fully functional, the only issue I see is the tank car is missing the ladders.
Just pay actual shipping and they're yours. They fit in a Medium Priority Flat Rate Box, so $10.50 in the CONUS would be maximum. If you're close, it may even be cheaper.
Respond here if you're interested.