I'd give prices over the phone. If you are charging $200/month and my limit is $50, then there's no reason for me to come in and see if I like it or not. I can't afford it, so why waste your time and mine? Like Brian said, straight forward and honest is the best policy.
"It has been said that politics is the second oldest profession. I have learned that it bears a striking resemblance to the first."- Ronald Reagan