I received an unwelcome surprise changing USD in my local cueva today. Evidently, today's 6.1 rate is only good for 100 USD bills and they give only 5.9 for 20 USD bills. Now I know Argentines have so many angles that it's impossible to calculate in advance all the ways they try to take advantage of foreigners so I'd like to know if anyone else has heard of this and whether these rates make sense. It was 6.15 only 3 weeks ago.