Just got off the phone with the seller. They are still available. I know, $150 sounds like a lot but I'd spend an hour just cutting each one up. I think that would be a about 9 hours minimum. Knowing me...I'd spend two days on it. They are solid oak and he said they have some chips in them but they are still useful as is.
He used to teach shop at the local high school up in Northern Vermont back in the 1980s. He was a Navy machinist prior to that. He figured the models would be the easiest way to show the students how the angles should be ground.
I asked him if the angles are "theoretically" correct. He said they are based on his experience, but we then talked about all of the variations and experience that comes with changing rake angles, radii, etc.
Sounds like he wants the cash...not willing to take trades.