Yuma, AZ

 Stayed at a 55+ RV resort with mostly Canadian snow birds (winter visitors).

I needed some dental work so we headed across the border to Los Algodones, MX. The popularity of both inexpensive prescriptions and medical care catering to Canadian and U.S. citizens has caused an explosion of pharmacies, opticians and dental offices.They have largely displaced the typical shops you might see at a border town, but we did have a nice lunch at this cantina

 Yuma grows 90% of the US lettuce crop.