There are lots of reasons for price differences, especially between US and Canada. Lots of exchange rate stuff I can't keep track of, import taxes, import costs, other taxes, blah, blah, blah. Its a bit here and there but does add up.
And there's the name brand versus off brand discussion. That can go on forever. I usually prefer name brands, but do buy off brands in some things. One thing you have to watch with herbs and spices, Joyce, is that name brands usually process correctly for the most flavor. Off brands, not so much. Processing can be expensive thus the increased cost to the consumer. I've found that difference is worth it. Same with supplements.