Woodworking projects generally require, well, wood. You can get dimensional lumber (e.g. 2x4s, 2x10, ) and plywood from Home Depot, Lowes, Tart (Sterling), TW Perry (Leesburg), Loudoun Lumber Co. (Purcellville), etc. Rough lumber is where you'll find more variety of types like maple, cherry, oak, etc. Rough lumber is sold in 4ths, so a 2/4 thick piece of lumber will actually be 1/2 (as opposed to dimensional lumber, which is usually 1/2 inch smaller than the stated size). Rough lumber is sold by the board foot.
There are several sources of rough lumber in the area. If you have used any of these, please add some comments/reviews about them. Know of others? Add them to the list.
Tart Lumber in Sterling, VA
All of our Lumber is produced from trees locally salvaged from construction sites in Northern Virginia.