The Zimbabwean dollar has been out for some time now. Currently, people use both US dollars and Rand in Zimbabwe. If you pay with a large US bill, you will most likely get back a number of US $2 bills and a fist full of change in Rand. As well, you'll want to wear rubber gloves because the money here is dis.gust.ing.
(a $10 bill from America and a $2 bill from Zim)