Any cheap source for TPMS tool?
 

The manual describes using this special tool for the required TPMS initialization every time you switch to different wheels with TPMS monitors: Kent-Moore J-45295 TPMS Initialization system which is $335 (ouch!).

See it at
Kent-Moore J-45295 TPMs Initialization System


Does anyone else know of a tool that works on our cars that's cheaper? I was thinking of $100 or less (wishful thinking)

Precisely, wishful thinking =P.

You can also initialize the TPMS system using Consult III, which costs around $8000

I researched this a lot for my G37. The kent-moore tool will activate and initialize the tpms sensors but you need the consult III to tell the car to look for them.