Personally, this is the type of product that begs to be borrowed. Of course, colors may change over a period of time, especially with CRTs, but with this type of usage, I would more or less try to bum it from anybody.
If you are in an organization/business/university they might have a department that does media or some type of design work. Borrow what they have unless you know it sucks. Also, most cities should have design firms in them, firms that do local ads, tv whatever. Maybe you could convince them to rent one to you for the short period of time you'll be using it.