So I went to the Citibank and my debit card would not open the door (early evening) as it had a number of times before. I seriously needed money so went down the street to another bank where my Citibank card worked fine to get me in and the system gave me 700 pesos, all in hundreds. One of the popular features of the Citibank locations is that they give you a mix of change with each transaction, but so be it.
Then I went to a Farmacity nearby and picked up a box of condoms for 13 pesos and gave the clerk one of my hundreds. (I had almost no other money. He said he couldn't change a hundred, that he had no change. I pointed out that the man ahead of me in line had just given him 72 pesos in cash. He politely pointed out that 72 + 13 was 85 so he couldn't make the change. Did I have a credit card? No. So it was impossible.
I passed another Farmacity. I like these big chains because they always have plenty of change and really good service.
(And I know where they hide the condoms. This one was really busy and I had to wait in line. The clerk here was horrified at the 100, but this time I pretended I couldn't understand him and the security guard came over and told him that I was a gringo baludo (clueless) and he opened up his change drawer which was full of change and did it and was nice about it.
Apparently they have little change because they regularly stuff money into little safes so that in case of a hold up, the effects are minimal. In the meantime, the customers can go fuck themselves.