What an incredible and "odd" story. I am glad that you think overall this woman runs a "nice" store. It sounds like she could use a little "Business 101" training. Perhaps she is struggling to stay afloat in this online shopping society but she should not resort to lying to her customers. Even if she is displaying cards with images she doesn't carry she could find the information and have it available to give to a customer if someone asks. If she can't just order one stamp from one company as a special request I would certainly respect her more and continue to buy OTHER things from her if she was helpful in locating an item I wanted but she didn't or couldn't carry in her own store.
Glad you were helped by this wonderful crafty community we have out here!!
Mary in NC