Here in the DC area, every once in a while I go to an ATM and punch in “$100” expecting 5 crisp new $20 bills to shuffle out. Instead, one $100 bill is dispensed. It’s actually a bit of a letdown.
Bank of America ATMs, in particular, seem to be stocked with $100s.
Several years ago, I was in La Jolla, very nice place in town. The ATMs ONLY dispensed in $100 increments. I had never seen that before. Of course I once came across an ATM that dispensed in $5 increments but that was in Baltimore, in a not so nice part of town.