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Rokinon Authorized Dealer bestpriceoptics via eBay has the Rokinon 8mm f/3.5 Fisheye for Canon for $199.00. This ties for the lowest price ever on this affordable and great value lens.
Note this isn’t the “HD” version so you won’t get a circular view with a full-frame camera as it is partially obstructed by the non-removable lens hood.
You can see some fun and creative photos taken with the 8mm f/3.5 fisheye in the Flickr group for this lens.