Amazon.com (via Boxwave) has some good deals on right now for the Samsung Galaxy S3 Boxwave cases. Most cases are in the $12-$15 range, but you can save an extra $10 off of that with the promo code: LOVESGS3. This makes this a much better deal.

You will have to pay shipping for the cases and each additional case you buy will add a small amount to the shipping cost. Shipping was around $6.50 for me, plus an additional $3 or so for each additional case.

Note: make sure you have selected a case from Boxwave and not Amazon.com, as only Boxwave will ship these to Canada.