Link from an online parts catalog at a local auto wrecker - they have 4 used Ford ones in inventory. Probable cost is under $100. They warranty and ship around the country.
350668553163 Ebay part number for aftermarket converter, complete setup, pipe, etc. Bolt in. 60 day warranty. $180. 99.2% positive feedback.
JC Whitney - Eastern Direct Fit converter - $270. warrantied.
The remove and replace of the converter is extremely easy - tools needed - breaker bar, socket set, socket extensions, jack and jackstands, Never Seize O2 sensor socket
gaskets (from ford)
open hood, remove 4 bolts and remove exhaust heatshield. Remove O2 sensor. remove 3 nuts on studs.
Raise car, remove bottom o2 sensor, remove converter retainer, remove converter to exhaust line bolts and remove brackets, lower converter and remove, install new converter, retighten all bolts install O2, lower car, install top O2, install nuts install heat shield.
This is like an hour project if you have all the parts ready and the tools ready.
With an aftermarket converter let's say $300 from a local shop, 2 O2 sensors, $100, gaskets & misc shop supplies, $50, labor $50. $500 is about right. If a shop does it they will warranty that it does not work.
With you doing it from a Ford wrecking yard converter - maybe $100-$150 With you using some guy from Craigslist who moonlights auto repairs and a wrecking yard converter - $200-$250.
Since your convinced it's the converter and aren't willing to try changing out the O2 sensors like I said to do, you might as well use a wrecking yard converter from a local wrecker since your going to be putting it in and taking it out to return for another one about 2-3 times before you look at the O2 sensors. That will be a Ford converter so you won't have to worry that it won't fix the CEL.
All these cars use the same converter so they are plentiful in the wrecking yards. The yards only inventory catcons from wrecks where the engine will start and the CEL is not set.