I used Questar to get a replacement M98 barrel from the U.S. If I remember correctly, the barrel price could not be over $100 and the barrel was sent to their U.S. office for paperwork and clearance. There was a $50 fee for processing plus additional shipping to my place from their office.
If it's worth it to you, it is possible to import one. If you run the gauntlet without the paperwork, you run the risk of losing the barrel.
Stocks are different it seems. I have bought and had Mauser stocks shipped to me from the U.S. without needing any paperwork. Mind you, the stock prices were under $100 as they were beat up quite a bit but still usable. I always ask the seller on e-bay if they ship to Canada before you buy.