Stay away from the ebay item, IMO. Their return policy is all but non-existent (NO returns on non-defective, 15% restocking on everything, UGH). Others here have mostly reported poor quality with "crystal optics" lenses.
The item at porters seems somewhat better, and if they have a good return policy (didn't immediately see it), it might be worth experimenting with. It's a "circular fisheye", which just means a very extreme fisheye effect. It's likely that you might get a range of fisheye "focal lengths" by zooming your camera lens.
If you decide to go this route, when you get it test the heck out of it immediately and if it is optically poor, return it.
Most especially, check that your camera will focus properly with it over a reasonable part of your zoom range; it will probably work best in only a portion of your zoom range, and you'll want to know what the limitations are.
These lenses can be fun; I even submitted this
full-circle fisheye image for a challenge here. It was taken with a Nikon fisheye adapter on a Nikon Coolpix 995 camera.
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