Have you looked at the Seidio Obex waterproof cases for the Samsung Galaxy SIII? They are available from Canadian on-line retailers with free shipping.
- Case exceeds the IP68* rating, signifying that it is both dust-tight and protected against complete, continuous submersion
- Critical points of entry are blocked by a two-stage protection system
- Anti-reflection glass protects the camera lens without interfering with photo quality
- Waterproof membranes shields the microphones and speakers while maintaining with sound quality
There's also a combo package with a case and holster.