Good Mexican restaurants usually have a decent selection. You may have luck at more normal bars where you are at, as well. Some places even have tequila/mezcal specific bars. Just know that wherever you go, the bartender is unlikely to know much about what they stock, and won't be much help in making recommendations. It'll be up to you, but that's where that TMM app is so helpful. Just plug the brand name in and see what the ratings are more importantly, how it's made. Stay away from anything cooked with an autoclave if you can, and don't even consider the diffuser-made junk. Good luck!
I'm in a large city on the eastern half of the USA I think I have located at least one Tequila bar here. Say, a Mexican restaurant! That's a great idea! There are several excellent ones nearby. Tough part will be sampling tequila while only eating chips n salsa, while my wife consumes a full meal in front of me. She will be the designated driver