Estoy en la tienda.
The Spanish word for store is "Tienda".
You can say "En la tienda".
eklaoda
supermercado = supermarket
When you want to say toy store in Spanish, the word is juguetería
almacén de piensos
tienda de deportes
It is the same in French, English, and Spanish: boutique (a specific type of store or tienda).
mi tienda favorita es
Because Hollister is a brand name store, it would not have a Spanish translation. Hollister is Hollister in both Spanish and English.
I think it's horas de tienda. :)
Tienda de mejora hogareña