pulverizers

Does anyone have a good source for a used concrete pulverizer for a 200-300 size excavator? I don't really want to buy a new one they seam to be kind of high priced for what they are. Looking for a cheap way to break up some old concrete so I can reuse it for rip rap and other things. I keep watching the auction sites but haven't spotted one yet. I am not really in a hurry.

pulverizers