Remember, "exotic" depends on where you live. If you watch Iron Chef, the original one from Japan, you'll see whenever they have a dish with avocado, the guest judges always proclaim "Avocado! How Exotic!"

Even within the US the availability varies widely.

I doubt the grocery stores carry many around here if they do at all. They probably blend in with all the other greens. I'll check for them next time I'm at the store.

Walmart's online stock search returns no avocados for the local store, so I doubt the smaller grocery stores have them: https://www.walmart.com/store/520/search?query=avocado