Chapters Indigo has great prices right now on a variety of Kobo Reader covers in-store and on-line.
Before going to the store I would call ahead and check for stock first. Dartmouth Store has the Silicone covers for $2 and the Bookstyle covers for $5
Shipping on on-line orders to Halifax Dartmouth area is about $7.50-$8.00. Even with the shipping its a good deal. They are offering free shipping on orders over $20 but make sure to read the details.