Calling is a bad idea, they'll turn you down and/or lie. Take the time to occasionally drive to as many stores as possible. I've heard countless success stories from those that drive in.
True. I had forgotten about the Target store that lied to me. I called them and asked if they had any, they said no, then 15 minutes later I was near there paying a bill and wanted to stop there and get a CD. Walked out with a Core System for my brother.