A quick search of Autozone shows universals (not compatible with CA emissions) at about $90. Factory fit are between 300 and 400, depending on your engine (4 or 6 cyl). The position of the O2 sensor is different on different converters.
To remove the converter is against federal law, last I heard (maybe different now) the fine was $40k if a shop hollows it or bypasses. I'm not sure if it's illegal in your state for the private owner to remove or not, but why would you want to? The car is designed to run with the cat. It's actually a bigger hassle to bypass (having done this myself many years ago) than it is to remove/replace with an aftermarket factory fit cat. It should be bolt-in, so lots of PB Blaster, and about 1/2 hour of time. Get an exact-fit, soak the bolts with blaster, remove the 02 sensor, remove bolts, put new cat in place (use new gaskets), secure with bolts (you can use hi-temp anti-seize to make it easier next time), tighten bolts, coat 02 sensor THREADS(!!!) with anti-seize, and tighten everything up. No big deal, it's way easier than trying to fit a straight pipe or universal cat. And cheaper than a car payment.
Now, consider... Why did it fail? I have cars 20 yrs old+ that still have factory cats. Did you have a check-engine light? Running rich? (a bad 02 sensor can make a car run rich and destroy a cat in a few miles). Was it just rotted out? Short trips, incomplete warm-up phases destroy exhaust systems due to condensation build up that never clears out.
Best of luck to you. Only fools go to dealerships for maintenance, if you really don't want to do it yourself then call around to local shops or buy the part and see if you can get a shop to install it.