Companies that Still Don't Ship to Canada?

mstich asks: "I'm curious as to why some companies make it so difficult to ship to Canada (from the U.S.A.). I'm only about 200km (124mi) from Detroit, so distance surely can't be the problem. Companies like NewEgg state that they won't ship to Canada, even though they will ship to Alaska (albeit, at an inflated cost) and some, like Crucial, do ship to Canada but they won't extend their 'free second day shipping'. Are there really that many underlying costs that show up when crossing the border? Is this just another money grabber? Does NAFTA fit into all of this, somehow?"