Before you flag the converter as bad, they rarely fail unless physically, lest figure out what your problem is.
Who/why were you told the catalytic converter was bad?
Do you have a CEL and if so, what codes are you getting?
Catalytic converters are blamed for problems all the time and they are often replaced when they do not need to be replaced.
If you need a converter, check ebay for user Muffler Express out of Canada. They have nice products with OEM style flex couplings and comes with a manifold gasket for usually under $250.
But again, lets make sure your converter does in fact need to be replaced.