Good morning, Hoffy;
The fast Minolta ROKKOR telephoto lenses.
You should be able to find the Minolta MD 135mm f:2.0 and the Minolta MD TELE ROKKOR 200mm f:2.8 or the MD 200mm f:2.8 from right around 1980 with a reasonable search. The real challenge is finding the Minolta AUTO TELE ROKKOR-PF 100mm f:2.0 or the MC TELE ROKKOR-PF 100mm f:2.0. The 100/2.0 is from the early to middle 1960s.
Pricing? You are talking about a limited production run for the 135/2.0 and the 200/2.8. The 100/2.0 now is considered to be rare. There are not really enough sales records to provide any real guidelines for these lenses. It probably will be more dependent on negotiating skill and the knowledge of both the seller and the buyer. I cannot really offer any suggestions on where to look for these lenses and any selling prices for them. KEH may have some records, but they are not at all extensive, and they seem to just dissipate after a few months. As just a guess on my part, I feel that the middle to high 3 significant figures, or possibly now up into the low 4 significant figures, might be what you will encounter for initial asking prices. We are not talking that much about working lenses here. These have fallen into the "collector" category now. But then, you could encounter someone who is trying to sell their father's old cameras, and is having difficulty finding anyone wanting to buy older film camera equipment. Who knows?
Enjoy; Ralph, Latte Land, Washington