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Hi,
If I were you I would:
Follow Art's advice and get yourself a used Bosch AMM. You can find plenty of used Bosch AMM on Ebay for around $50-many sellers offer a return option if it's a dud.
Grab a Bosch O2 sensor (get #13034 for ease of installation if you don't want to splice it in) from either Ebay or Amazon for around $70.
I wouldn't take it to a shop, they would easily charge you more than the $120 listed above. Seeing that you were able to do the tests in your first post you will be able to swap out the items yourself easily.
If you end up not having to swap out one of the above you will have a spare-which you will thank yourself for later on when the part is needed.
Travis
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