Cheap fisheye lens for Nikon DSLR?

All the fisheye lens i'm seeing are in the $400+ range, and I can't afford that.

I have a budget of no more than $250, and NO… I do not want the "screw-on fisheye adapters" for less than $20.

I want the REAL lens that I can attach mount to mount.

I have a Nikon D200 if that helps.

And I'm willing to get used/older/manual focus lens.

For that price point your gonna have to do some real bargin searching. Probably even have to look at other lens manufacturers with Nikon mounts. If you found fisheyes for $400.00 I think thats pretty good. You can look around for the Nikkor 10.5mm Fish. But I doubt you'll find one for 250. I paid over $800 for mine

You could try one of the Russian lenses at
http://www.rugift.com/photocameras/nikon_cameras_lenses.htm
Reviews on RUGift seem to be variable. Long shipping times seem to be common.

Find non existant cheap fish eye lens for the N brand using internet search engines.

Tricky. There's that 8mm bower/samyang of course which sometimes goes used. Then there's the older 8mm peleng which you sometimes find used but at your prices that will be a beat up version.

Fortunately for you these fisheyes will mount and meter on your camera. Older nikons may not, there's quite a few really old nikon fisheyes that will stick too far into the camera.