Taking place across a border.
(quote-book)
{{quote-journal|en|date=May 28 2008|title=Canadians not cross-border shopping like they used to|titleurl=http://www.cbc.ca/news/business/story/2008/05/28/travel.html|journal=CBC News|accessdate=1 Nov 2011|location=Canada
(quote-journal)
Across a border.