I haven't been picky about sketch books for some time, but when I was, I was partial to a brand of hardcover books the name of which escapes me. I liked the hardcover because I dragged them along everywhere I went, which included backpacking, bike touring, ski trips. They took the beating. I filled probably a dozen of them, and they are all up in the attic now. I just get Strathmore 400 wire bound 5.5 X 8.5 now.
I was on a cross country train trip and needed a new sketchbook. There was a short stop in Chicago, so I figured there would have to be somewhere within a short walk from the train station. This was pre smartphone, but I'm a map nut, so I knew my way around, but not where something as specific as a sketchbook would be. I started walking in one direction, gave myself 6 blocks, and if I didn't find it by then, I'd have to (gasp!) ASK someone for help. Luckily I found a book and art supply store around block 5, right near a Whole foods store, so I got the sketchbook I needed, some pencils and food supplies.