I just found out my 94 Accord EX (4 dr sedan) with 118,800 miles needs a
cat. converter too; it failed emission test.  The price quoted by my
dealer was $35 state inspection fee, $88 diagnostic fee, $700+
converter, $200+ labor for a whopping total of $952+.  I looked at
various sites and saw that $706 was the list price for the part.

Yes, there are places that sell parts for a lot less than L.P., but I
guess it's up to you whether or not to trust them.  While I think my
dealer continually overcharges, I don't know who in my area doesn't.  At
least, I can go back to my dealer and complain a lot if something is
done wrong or a part is faulty, and once in a while they hear me.

Good luck.