1. Buy a Google Voice number
2. Call using a nickname
3. Do not ask about the price when you get on the call with the sales team or whoever let them ask questions and do their pitch on the phone. Depending on what it is they may want to do demo with you via Join.Me or Skype. Just go with the motions.
4. Ask about how they separate themselves from the competition. What makes them better?
Companies love talking about themselves. e
5. Finally at the end ask about pricing.

I have done it many times.