You could probably make explosives from manure. Use that to conquer a small community and make yourself the leader. And start a rebellion against the local lord and become the king. Then you have the resources and slaves to find copper and magnets and shit. Problem is the massive language barrier. Their language is just gibberish to us and vice versa.
You can get it in Canada. You need to give a good reason to get it, but I'm sure time travel would qualify. If not, just say you're a laboratory worker researching Smallpox, and they'll give you the vaccine.
I don't know if they would be willing to give you the smallpox vaccine in order to go back in time and totally change history so none of the people involve in giving you the vaccine would ever have been born.