Here in MA I don't think scrap yards accept catalytic converters without jumping through some hoops or knowing someone at the scrap yard. I had to replace the exhaust system on a previous car - Ford Focus commuter car. The Focus has 2 CC's, one integrated in the exhaust manifold and another near the muffler. When I had the whole exhaust system replaced I told them I wanted the old catalytic converters back so I could sell them to the junk yard and reclaim some expenses.
When I called the junk yard they said they don't buy stand alone CC's (probably due to people stealing them and the didn't want to be part of that). It had to be attached to the car or you needed some proof that you owned the car that it came off of with my name, address, copy of my ID, vehicle VIN number and stuff. Too much of a hassle for $100 or so.
I don't remember what I did with it. Probably let a scrap collector take it way along with some old steel rims and and old clothes dryer I had in the basement.
Maybe I should have called Jonsie and we could have split the profits.