I think he was talking about the type that grind a little bit of the gravel and tar off for a patch or resurfacing.
I deal with two nationwide rental chains on occasion, NationsRent and United Rentals. Neither of them have a spudder in their inventory. I do notice that they're only about 2 grand. Might be time to break out the Master Card. Or, perhaps you could approach the rental store that you prefer to deal with and see if they'd consider adding it to their inventory.
Just a thought.