What is a reasonable cost to replace the catalytic converter?
This site will give you a good idea what it will cost based on where you live , see below copy and paste
Have a mechanic check it- don't just guess- if you smell gas inside the car, that is a dangerous condition- there may even be a couple of problems at the same time- having said that, a cat is expensive- they have precious metals inside which work chemically with CO- that is why thieves like to get under SUVs in the middle of the night and steal them-
Don't put it off either, just read in the news an 8-yr old died from fumes from a missing catalytic converter while driving around a couple hours with his father.
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