What's the price for 10 filters? I would ask the parts department who makes the filters for them. Personally I no longer buy oil filters in Canada. I wait until I visit the in-laws in the US.
For instance, I used to buy Napa golds, until they got to over $10 each (before taxes). Even in Pennsylvania there were $7 each.
When I went to Advanced auto parts online, I was able to get Purolator Pure Ones for $4 each before taxes with their online sales where you buy online and pick up at your closest store.
Now you are probably concerned about voiding your warranty, but maybe you can get them cheaper in the US. Do you know anybody in the Detroit area?