Here's what he had to say about it: "I visited the Super Potato store in the Osu section of Nagoya quite by accident... Holy crap, this place is astounding. It is crammed with consoles from the third generation on, games, peripherals, original strategy guides, posters, figurines, game soundtracks (seriously, they had the soundtrack to Elevator Action Returns)... I got about half of my souvenir shopping done in one stop. I really want to see their original store in Tokyo. I didn't take pictures inside, since a number of stores discourage that sort of thing; I wasn't sure if that was the case here and I didn't want to risk it."
Awesome, Jeff, thank you!