Honda accessories are available in Canada but you have to do a bit of digging. Someone posted Dalts Honda in Ontario sells CD changers for ~$200 CAD and they do mail orders. Also, those weathertech mat is available through mail order as well from a company in Ontario. For towing package, Lordco offers a lot of choices through their on-line sales department and their prices are cheaper than the one you get in the stores. I got a quote on a hitch, bug deflector, tranny cooler and security alarm system for a 2002 LX and they are not only cheaper than the equivalent in the states, they are cheaper than retail prices.
In conclusion, they are available but need a bit of digging and are not as centralized as the states. However, for geniune honda stuff like roof racks, i-ves, alloy wheels and fog lights, you still have to buy them from the dealers. BTW, there are lots of aftermarket fog lights (i.e. piaa) that will look very nice on the ody. Plus with piaa, you get the ion crystal bulb instead of the white halogen from honda.