noun
art supply store
A shop that sells materials for painting, drawing, and other visual arts.
駅前に新しい画材店がオープンした。
A new art supply store opened in front of the station.
文具店 is a stationery store, which may carry some art supplies but is not specialized in art materials like 画材店.
Compound of 画材 (art materials) + 店 (store).