Binders is a great resource for all your art projects. I've used it as my favorite place to pick out gifts for creative types. I got a cool little portable light table there, and when one of my favorite tattoo artists was in town, we went there to find the special kind of watercolor markers he likes to use when he's designing flash sheets.
If they don't have it, they'll get it for you. It's a lot different from Michael's or the Hobby Lobby in that it mostly specializes in fine arts. You won't find a lot of stuff for beading or knitting or other crafty kinds of projects. If you're looking for the best materials for fine arts projects, though, Binders has everything you could need.
I signed up for their email newsletter, and it's not even annoying! It only comes occasionally, and they let you know about special deals and discounts.