Where do they sell leaf stones in celadon dept store?

Leaf Stones are not items found in the real world, they are from the Pokémon video game series. Celadon Department Store is a fictional location from the games.

If you're looking for something similar, you might try searching for "leaf stones" or "stone pendants" online or at a local craft store. You may also find some interesting items at antique shops or specialty stores.