Looking to buy a fisheye for my Nikon D5000?

What do you recommend
obviously price is a factor so where can i get it less expensive

Fisheye lenses are expensive and nobody that I know of gives discounts.

If you're not too fussy about quality, you can look for add-on lenses.

If you want nikkor's one, i don't think there're less expensive ones. But other brand i believe there are.