Where could I get a fish eye lens for my Canon Powershot SD 1300 IS?

-Where could I get a fish eye lens for my Canon Powershot SD 1300 IS?

Mostly for Skateboarding. On the Lens it says:

Canon Zoom Lens 4x 15

5.0- 20.0 mm

1:2.8-5.9i have seen attachment fisheye lens adaptors at walmart int he photo section i would check there. if not try a local camera shop.