I want a fish eye lens?

I have a Nikon D3000 and I want to buy a fish eye lens for it. I'm totally clueless on what to get so could anyone be of help? Also how much would it cost and what are the cheapest ones?

There are two Nikkor fisheye lenses currently available. They cost around $600.00

You have two choices.

The Nikkor AF 10.5 mm fisheye, $680

Or the Tokina 10-17 mm fisheye zoom, $580

Usually we rent fisheye's, unless we're generating enough income from using them to justify the investment

A fisheye lens can cost as much, or more than (your) camera. They are not something you would be to use on a daily basis either - this means it is not a "walk around" lens. You play with it for a while, then you find that photos come out too strange--and you put it away.

Like fhotoace said, rent one and see what it's like.

I would consider.42x HD Super Wide Angle Panoramic Macro Fisheye Lens

INCLUDES 2 PRODUCTS -- with all Manufacturer-supplied Accessories and Full USA Warranties:
<#1> Polaroid Studio Series.42x HD Super Wide Angle Panoramic Macro Fisheye Lens + Lens Case, Caps
<#2> DB ROTH Micro Fiber Cleaning Cloth

I think you should go with Precision Design 0.25x Super AF Fisheye Lens

All glass lens elements; Exceptionally large depth of field
Reduces your lenses focal length by an amazing.25X; Offers attention-grabbing and distinctive perspectives
Optimized to work with almost any lens with a minimum focal length from 18mm to 50mm
Includes set of adapter rings to work with 52mm, 55mm, 58mm & 62mm filter diameters
Can offer ultra wide angle, diagonal fisheye and circular fisheye images; Especially useful for real estate or shooting in confined spaces