"...Will an American supplier send me a box or is there some kind of cross border laws for buying ammo..." No and yes. Ammo requires the U.S. export permit that takes a Canadian import permit to get. Ammo must be approved for importation by our side too. You can't go there and bring it back either. Read the 'Sticky'.
Epp's does list it. Likely Norma. Pricey stuff.
Buying ammo on-line is expensive due to high shipping costs.
"...cheap reloads..." Never, ever shoot other people's reloads. Unless it was loaded by a licenced commercial reloader, you have no idea if the guy knew what he was doing and it's illegal to sell reloads without a licence. That doesn't affect you.