What fisheye lens can I use on my Nikon D5000 18-55mm?

Hi! I'm looking to purchase a fish eye lens for my camera but I don't know what size to buy that will fit onto my 18-55mm lens. Help would be much appreciated!

Could you tell me EXACTLY what I need, everything and anything about it.

The 18-55 mm uses a 52 mm filter thread, so you would need a nice, cheap add-on lens/filter that promises to give you a "fisheye" look.

You do know that a fisheye by definition covers 180 degrees and many cheap add-on lenses fall short in that arena. But for under $40 you can't ask for much when a "real" fisheye lens like the Nikkor 10.5 mm lens costs $775.