And a few stores down was Castle in the Air, which is where I found the mailbox stamp. I'd been told about this store a couple years ago so I was very happy when I realized the two stores were so close to each other. They stock all sorts of letter writing material, including pens (fountain, dip, glass, roller balls, and ballpoints), fountain pen ink, sealing wax and seals, rubber stamps, fine writing paper and journals, cards, and more. Unfortunately, I apparently forgot to snap a photo of the storefront but we hope to go back so I'll try to remember to take one then. And they offer lots of classes, including calligraphy. They are a bit expensive but I'm really hoping I can take a class or two there someday (the one I'm most interested in is already sold out so I'll have time to save up).