LOOKING FOR CHEAP/ER FISHEYE LENSE FOR SONY DSLR A200 CAMERA

I'm a student with a Sony A200 DSLR Camera.
I'm looking for a cheap/er Fish-eye Lens that will fit my kit? Because there's no way in hell I can afford the one from Sony. Its around $1, 499. (AUD)
I use my camera all the time, but not for major tasks so the lens doesn't have to be industry standard just not cheap Ebay rubbish.
Even if you know any other brands that will fit, like a Nikon or maybe a Canon that will fit?
I only really don't want to spend more then $200 (AUD).
Thanks for your help! (:

Added (1). *** I want a CIRCULAR FISH-EYE, didn't know there was a difference but apparently so.

Sigma, Tamron, Tokina also has lens for Canon and Nikon so they might have for Sony too might. I guess you didn't do much research before buying Sony DSLR did you, now you r stuck with it. U invest in lens more not the body!

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