*Ask at least two different people if they have any postcards or postcard books. Explain... "You know the ones where you can rip them out?" The reason for asking two people is they each might know where at least one is and they will point it out to you. The reason for explaining.... I don't really know, but it seems to wipe away the puzzled looks for me.
*BROWSE the store. Think about it.... postcard books. What section would that be in anyway? Exactly. You don't know and neither do the people putting them on the shelves... and because of this - they will be scattered throughout. I usually check the counters when I walk in, display shelves, travel and art sections and especially the "gift" books section.