Let me know where you went. I had a real hard time finding any "real" ISOM's let alone any decently kept non-ISOM's in Mazatlan.
The one's I did find were way off the beaten path where I had to use my, barely enough, Spanish. I can't even remember the name of the store, but that had a lot to do with a Corona ingestion issue.
Mexico is hard to get the real deal.
rayder1 at aol dot com