My favourite place to stock on wrappings, ribbons, boxes and bags is Creative Bag (off Allen Road, north of the 401).
Their selection is huge! Prices are great. You can visit their website to see what they carry but I much prefer to visit the place itself (for the thrill of an Ali Baba's cave), plus they have a few items not shown on their website.
You can see photos of Creative Bag in the post I wrote in my French blog (Passions: 100 façons). Sorry, I did not have time to translate it but as they say, a picture is worth a thousand words... (well, my i-phone photos aren't that great, so maybe they're just worth a hundred).
More Christmas related posts from Nathalie Prezeau.