All these itasha can be found parked in the lot between Kokusai Tenjijo station and Big Sight.

Was the first time I got to see the cars first hand and am envious of the owners because my wife does not want our car plastered with stickers of Mirai-chan ^^;

I did do some research into the stickers and it costs 14000 yen for a 500mm x 500mm weather proof sticker sheet - available for order from Palec.