Not surprising for that far north and rural areas. Did you find any Sotol or Bacanora? That's the regional variant drink you'd expect to see being sold if you looked. I don't think those are Mezcals (agave based) but other types of plants. Sounds like you guys ended up with aguardiente instead? Ps you can now sometimes find Sotol in better liquor stores in the US if you want to try some northern hooch. Had to look it up...part of the asparagus family of plants...mmm I'm drinking my vegetables https://spy.com/articles/lifestyle/food-drink/what-is-sotol-liquor-where-to-buy-219159/ While Bacanora is actually a Mezcal https://en.m.wikipedia.org/wiki/Bacanora Mmm, maybe you ended up with some low grade Bacanora?