The Canon F-1, a fully mechanical slr, uses the FD mount. This glass is relatively cheap since the mount was discontinued 20 years ago, but is of high quality.
as said earlier, the price of FD lenses has been affected by 4/3rd users, as well as adapters made for the various digital SLR systems sold today. They aren't really a deal any longer. The film shooter should hope that #1, film continues to be sold, and 2) that digital SLR system manufacturers lower the price of their lenses to the point where their customers don't need to buy old manual focus lenses.
in my recent experience, the price of FD lenses as well as Olympus lenses have increased to the point where it is difficult to stock your camera bag with more than 4 lenses, before reaching the $1000 mark.
Also, I've noticed that Nikon lenses have remained fairly stable, given that all their lenses, save the pre-AI lenses, work with every new nikon mount camera.
That said, I shoot a Nikon FM2n that i purchased in fantastic shape for $75 a few months ago. I added a 24mm f/2.8 Nikkor-N Auto AI'd for $110, a Series E 50mm f/1.8 for $40 a few months back, and a 105mm f/2.5 AI for $140.
There are deals to be had though. If patient, one can find the 24mm f/2.8 AI'd for $40 (what I sold mine for last year :angry

, and 50mm f/1.4 AIS for $50!! (which I bought and subsequently sold for 2x as much).
although, if I had to do things over again, I would've kept my Olympus OM-4T with 24mm f/2.8, 50mm f/1.4 and 85mm f/2. God...what a complete fool I was to get rid of it.