You have received some scanner suggestions, but you have told us nothing about your friend. Is he/she a non-techy homeowner who just wants to listen or is he/she a hobbyist with some radio knowledge? The former will probably become frustrated with trying to learn programming and operation of a modern scanner and put it into the closet in short order (especially if any simulcast systems are involved.) The latter may have a shot. Your post in general is lacking a lot of information to make any kind of good recommendation such as:
Listening interests (Emerg services, military, aero, etc)
Budget (if you mentioned $500 to them would they say never mind?)
Technical level (housewife, ham, hobbyist)
Types of systems in his/her location (check the RR database)