Blick Art Supplies has everything you could possibly need in many categories of art supplies.  And although I purchase my supplies online, I can certainly understand one's desire to touch, feel, and ask questions in person.  Blick offers many locations around the U.S. Most of the time I know exactly what I want through many years of painting experience.  If I do have a question however their product support is exceptional!

Hyatt's All Things Creative, located at 1941 Elmwood Ave, Buffalo NY has everything and more!  So, if you need something right away it's not far from Jamestown, NY where I reside.