If you're referring to the fusion stickers in "The World Ends With You" then they are at the following places. Shiki's stickers are found in the D+B stores (Molco and 104). Joshua's stickers are found in the Pegaso Atelier (Shibu Dept. Store) and Dragon Couture (Shibukyu Main Store). Beat's stickers are found in the Wild Boar stores (Udagawa Back Streets and 104).