Good fisheye lens for reasonable price for nikon D-40?

I can't spend 900 dollars on the nikon fisheye lens.

Just take a regular picture and use Photoshop (which I assume you have because you are a photographer which I also assume because you have a nice camera)

Here's a pretty cheap fisheye lens that has actually gotten some pretty good reviews
http://www.bhphotovideo.com/...f_3_5.html

it will not autofocus, however.