There's one branch in particular near my office that always keeps some MWRs on hand. At one point I think they said they had someone who liked to get them, now I think they keep them on hand for me. That's nice of them, but these rolls have never produced. I've been through a total of about $700 worth, starting last fall. All are yellow and white String rolls from Dunbar. I was kind of surprised to be skunked after buying the rolls over so long a period.
A few other branches seems to get MWRs in from time to time, but I would agree that most branches do not keep halves stocked. Another bank near me said they had a box that a customer ordered but never picked up. Good thing he/she didn't bother - all the rolls were skunks. They tell me they have another box in the vault and I can get some or all of the rolls in it anytime I want.