There's a nice art store that just opened in the Castleton Area up by the mall on Allisonville RD in the Marsh Plaza. It's called Prizms. Much cheaper by far than some other places in the area on Prismacolor Colored pencils and markers and other supplies. I got a set of 120 colored pencils in a nice tin box for $84 there.

I'm not affiliated with them in any way, but they are really nice there - very helpful. One sales girl pointed me in the direction of a life-drawing class too - so I'll be signing up for that, too!