David: do you know if the original OM/Digitrac magnetic core is laminated like the Technics's?
[UPDATES: All the Technics bodies I've seen/owned, including a boron-equipped P22, have hovered around 360mH, with channels matching closely. Therefore, I'm convinced all the Technics p-mount bodies are the same. There was also a standard-mount version, the Technics U25-- same body.
Also, David claims in a following post that the Digitrac bodies are the same electrically as the Ortofon OM bodies. My 300 SE and four 200 NE bodies have consistently >100mH more inductance than my OM5 and OM-Omega bodies, not that this difference is audibly significant. Merely picking a nit.]
The non-boron Technics P-mounts are of surprisingly consistent good quality (although in my opinion the base ellipticals don't live up to the advanced bodies) and the bodies can be had for much less than the auctions the OP cites-- as little as $10 here in the US. The trick, as always, is to find an original NOS stylus for a reasonable price. I paid < $31 shipped, including a bonded elliptical NOS/OEM stylus, for my P328.
Some Technics p-mounts are simply rebadged Audio-Technicas of the AT92E type, so look carefully.