In my opinion MCG and others have the right idea about asking questions and building value before quoting the price. MCG's script says take control of the conversation by asking questions. I know some people struggle with that when the prospective customer seem hot to know the price right away.
If you want something specific to say to help get past price and into asking questions without upsetting the prospective customer try this...
"We do have a couple of (size requested) available. So that I can quote you the right price, can I ask you a few questions?"
99.9% of the people respond, "0K." to that question. Everyone wants the "right price". Since you are acknowledging that you understand they want the price and that you intend to give it to them, they nearly always will politely answer a few questions.
I know most people can only take so much of me, but if you can stomach a little more - this topic of converting callers to renters is the bulk of what I blog about over at
http://sellingstorage.com/blog