How much toothpaste do you use if you consider the .85 oz tube "nightly". One of those lasts me about a week - 2 weeks.
At either Target or Walmart I was able to find ~2 oz tube of Colgate Luminous. It lasted me a couple months.
Many people here seem to buy new toothpaste at each location though so they can carry on, but still get their specific toothpaste.