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bestpriceoptics (99.8% approval) is selling the Rokinon 8mm f/3.5 ultra wide fisheye for Canon (and other mounts) for $199 (Reg $289) via ebay.
This lens gives a wide angle fisheye look on APS-C cameras, and a circular fisheye look on full frame cameras.
Rokinon 8mm f/3.5 Fisheye $199 (Reg $289)