The catalytic converter on my old Ford Ranger pickup split open several months ago. It was cold, sloppy snowy winter. I'm retired and sold my business last year, so I'd have to lay on the cold garage floor, just like many DIY people here do. I didn't want an under-the-vehicle project in the cold winter.
My exhaust system was otherwise solid. I checked around the area muffler shops and found a guy, who I didn't know, to repair it.
He cut the old converter out and welded in a new one that I bought from the regular auto parts store. Total cost was $300. A sensible price for both of us.
Maybe you can find such a muffler shop in your area? Find out what your local auto parts store charges for a replacement converter, so you have an idea.
I've been a career auto mechanic and this is the first job in decades that I paid someone else to do (besides new tires). My Ranger runs fine.
-Engine overhaul mechanic and general overhaul mechanic since 1972. Retired in 2018.