If you are that close to the border, and it is a major crossing. Just go to the US customs office at the border and ask for information on what you want to do. You will have better luck finding out if its legal. If they say it is and you are still not sure get their card. I was so worried the first time I bought OTC codine.I stopped on my way in and asked. The guy said one bottle per person no count. And declare it. I said are you sure he then seemed amused and gave me his card. I have only done this a few times and I always tell them and only once did they even ask to see them.But you are in another area, If it is important take the time, make sure and do it right.