Old FD mounts?

I'm gearing up to do some wide field astrophotography using a CCD imager and an adapter that will allow me to mount Canon FD lenses rather than mounting the imager to a telescope. I am looking for cheap(would love donations ) FD lenses between 50-300mm. I do not care what they look like, I don't even care much if the lens has a scratch or two on the glass...

I am interested in buying, renting, borrowing, trading... leasing...?!

I currently have an FD 50mm, so I will not need that focal length.