Utrechthttp://www.utrechtart.com/ has been around since 1949; the Capitol Hill site is part of their chain. They sell some artist quality supplies, like Old Holland oil paints. They have their own like of materials as well. For art students, they sell a lot of pre-stretched canvases, though professionals usually strech their own. One of the nicer features of this place, in addition to its selection of art paper, is the fact that the prices are more reasonable than some other art supply stores.