How about a set of Samyang primes.
Not vintage, but they are inexpensive, high performance, and manual aperture+focus. They come with an EF mount so no need to mess with adapters.
Depends on how you look at it: compared to 50-150$ vintage lens 399-599$ Samyangs are expensive.
Sorry to interfere your post, Alibi86, but on the same issue: I'm looking for nice cheap (no more than 150$) old MF lens for macro (like the Nikon 105 f4 Micro). Any ideas on that? Is it a viable idea?
Also you should check Keh.com. They have very good deals on vintage lenses from.