Does anyone in Colorado know any cheap ways to get a catalytic converter/manifold exhaust leak repair?

I took my car into Goodyear today and found out I have a manifold exhaust leak and that I need a new catalytic converter. I drive a 2001 Honda Civic LX and am incredibly inexperienced with cars. The price estimate was $883.37 and I was wondering if anyone in Colorado Springs know of a mechanic that will do the repairs cheaper or a mechanic that will install maybe an aftermarket cat converter? If I looked for aftermarket converters, what would I need?! Thanks, Chase.

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