The 75 Nikkor isn't regarded as highly as it's 80mm brother.
If you're patient you should be able to get an 80,Nikkor/Rodagon/Componon-s/Rokkor for well under $100.
When you check Ebait, look at completed listings & you'll find that most of the asking prices are way out of line compared to completed auctions.
There have been several here in the classifieds for reasonable money too.