I bring a fair bit back but have never been assessed duty on wines I've brought back myself. I've always been up front that I was importing and have simply been waived through although I do this after trips longer than 48 hrs. I never bring more than a case back.
I don't know which province you're in, but if you're from BC and like older yet inexpensive Bordeaux there is a great little import company that brings in such a thing: Rooftop Cellars
- they import petit chateaux from recent to 15 years old for around $30 a bottle, cru bourgeois and grand crus are more expensive, but they are a great source for older wines that never make the shelves of the BCLDB. Their sister company is a good source of interesting Italian wines too.