Wow Wow Wow! Today I investigated CDP's and CDP's across a few brands to learn the cost of a donor model or Laser Reader/Mechanism, which are TOTR from the late 80's - 90's.
Intact CDP's are starting at near $500, heading north of $3.5K for other CDP's and CDT's.
A Laser Reader/Mechanism only was discovered very cheaply at an asking price of $800
I was thinking the big bucks were in Vintage Valves; we're all allowed to get it wrong on occasion.
Another thing I also learned is that a friend who was instrumental in getting me to have a CD Source had a pile of some of these models pre-COVID to be solely used as a Donor CDP. I was loaned donor models already been worked on with modifications, hence my change of thought to CD as a Source.

