Sorry had to tend to some responcibilities.
As to are they hard to find...yes and no.
There seems to be a fair number of them to the west of here...round here they're kinda scarce (people don't tend to want to part with em)....What's hard to find are the accessories!!! Especially around here. You occasionally see them on ebay but the catch is that as they are Iron, large and heavy, shiping (if available) is expensivish or you gotta drive a long ways to pick them up...
That said...If you're really good at scrounging and have friends willing to help you shouldn't have too much difficulty locating them.
I've been toying with the idea of converting one of mine to electric (battery) power! there's plenty of room under the hood for a couple of marine or golf car batteries and a reasonably sized electric motor. (Got the motor and solinoid, I just need the batteries!) Perhaps I'll even paint it green so it will truly be a green machine

! I figure it should be good for plowing, cultivating, and towing a cart.