Vivitar 8mm f/3.5 Fisheye Lens (for Canon EOS Cameras) - Video Camera Center
Amazon.com : Opteka 0.35X Professional Super Wide Angle Fisheye Lens with Macro Close Up for Canon Vixia HF G40, G20, XF205, XF200, XF105, XF100, XA35, XA30, XA25, XA10, XC10, GL2 and GL1
Professional HD Fisheye Lens for Canon EOS Rebel T1i T2i T5i SL1 EOS M EF-M T3 T3i T4i T5 T6i T6 (52mm or 58mm Compatible) - Walmart.com
Rokinon 8mm F3.5 Fisheye Lens for Canon Cameras - Walmart.com