If you cant find a source that ships too Canada you can try using a package forwarder, though it'll require more money. So for example you have a source in poland that doesn't send to Canada, you could use an address in poland that is a package forwarder company and then the package fowarder company can send it to you in Canada essentially acting as a middle man. I personally used this method, the source was in US (Its down now) and I used shippsy to send it me, keep in mind using this method means you'll have to declare the item for Customs so be careful. I declared it as something vague like "Nitrite Curing Salt" and it went through with no complications but if it worked for me it may not work for you since customs is really strict so be careful.