I'm a dedicated Maison Ikkoku fan, so I always picked up boards from that show during cons. Here is my set of nine; the ones in the top corners are my favorites. Curiously, all of them are titled in English, even the small text outlining the story.
I'm glad shitajiki fit perfectly into hole-punched comic book protectors, so I can keep my collection in a binder.
I never tried services like Shopping Mall Japan. I see auctions posted I'd like to win, but their service fees are substantial for items (like shitajiki) under 2000Y. There is always a middle man
