Domokun has an exhibition on at Parco in Shibuya where you can see some of the wonderful sets, cute figures, buy some merchandise from the shop and see a furry mascot standing outside.
I first spotted Ultraman in Odaiba, in a retro themed arcade shown left. I then found him proudly standing outside the Bandai headquarters who make Ultraman figures and toys. All the mascots have the distinctive yellow eyes and the red and silver costume. They also have a blue half sphere on their chest.