Hmmm there's something wrong with this logic..

1. 99% sure of the problem.
2. Not willing to spend $460 on a known part that will work and is important to fuel calculation, potentially lunching an engine worth $7K to replace.
3. Willing to go second hand and maybe facing the problem again or visiting the second point above due to incorrect fuel calculation and leaning out.

I'm a tightarse at the best of times, something as important as fuel sensors, MAF sensors, timing belts are worth the genuine cost.

Kinda like saying.. i don't want aids but i like riding bareback, sure i might get way with it this time.. but one day.. pow.. AIDS!