are you in New Jersey? if so im pretty sure there are a few guys in the state (possibly south jersey) who may be able to tune your pcm.
i'd start a new thread and call it looking for a tuner in new jersey. there should be someone who could help you out for a few bucks.
sure you could get a caned tune but you would need to send them your pcm, and wait for it to come back,(and be car less) unless you buy a used pcm and send that one off, either way it will cost more than finding a local guy to turn off the o2 sensor reporting.