Seriously - consider the use of a pay phone, or a hotel phone. It is often hard for me, and many other customers, to get completely accurate information on phone call prices. When it comes to phone calls, I've always missed some charge or tax, or there is change from when I last got the info.
So: (a) how many other economic transactions have this feature, that it is hard to get an accurate price? (b) If there are many such examples, should we think about "fuzzy" prices or "prices-as-sets", or "expected prices"? A lot of basic micro assumes there is a single number "p". Maybe we should think of price distributions instead. Fabio