I'm not really seeing the problem here.
Sure, we need to level the playingfield so cross nation trade can take happen but I don't think that a 10% difference in cost is going to be a big issue. That's more likely the difference in the cost of shipping or exchange rate than anything else.
$1:
The bill defines a Canadian product as one having more than 50 per cent of its value manufactured in Canada and doesn't exceed the comparable cost of another product by 10 per cent
This should be normal purchacing for Canada, but I'd ratchet up that 50% part.