Old memories from living in Maine.
Canadian oil (plus world market) refined in Canada, shipped to Maine and Canadians drove across the border to buy gas. The lines were long at border gas stations. The stations were at the time about 5 cents higher than other Maine stations.
American drugs, made in the USA, shipped to Canada, Americans drove across the border to buy them. Me for one.
Memories from living in Michigan. Buying a 5 gallon flush toilet in the great white North and sneaking it back home. Only needed to flush that puppy once, with a big duce.