I like the Art Coop, and I like that it's in Lincoln Square mall too. When I go to the farmer's market in the summer it's fun to drop in at the Coop, look at what's on view in the gallery, and browse around. It's also convenient by bus and a nice 20 minute walk from campus. I've found the staff helpful and friendly, and they don't hover while you're browsing. It's sometimes cheaper to buy online, but I've bought a lot of pencils, brushes, markers, and paper at the Art Coop that's fairly priced. Great store :)