This is a common problem with international companies selling in multiple countries.

Same product in Canada is cheaper if you factor the dollar exchange. Manufacturers must sell their products relative to that respective country's price point. It just so happens cars are cheaper in Canada (again if you factor the dollar exchange).

Daimler Chrysler is doing what other industries do now to protect their respective markets and dealers. Manufacturers usually try to penalize the "guilty" dealer of knowingly sending product out of their territory but I guess it is not working for DC. Flooding Canadian cars to the USA will hurt the US dealers who are competing with the same product but at a much cheaper price.

No warranty is a good deterrent. I would think the other manufacturers will follow suite.