How to make a cheap Fish-Eye lens for under 10 dollars?

I have just recently bought a 200 degree peep hole that goes on a door and was wondering how i could get it to fit onto my Nikon. Like say using some tubing that fits onto it. What tubing and method of making everything fit would I use?

Get old glasses
pop out the lens
hold it to the camera lens
there you go

Here ya go. Looks like a lot of fun.
http://tech.icrontic.com/articles/build_a_fisheye/

You should go this one
52mm WIDE-ANGLE Lens ~INCLUDING BAG~ FOR NIKON D40 D50 D60 D70 D80 D40X

Works on All Cameras & Camcorders with 52mm size Lens Filter thread
Professional High Definition: PHD Lens reduces glass flare & ghosting caused by reflections
Premium Rimmed Glass: High quality rimmed glass reduces light reflection around lens edge
Infrared Compatible: For high resolution day & night recording
This excellent lens can be separated in two pieces: macro part and wide angle part. So you can use it both ways