Yes, Paint Store online. Basswood is king. I prefer the 3/4" thickness in 6' lengths. Buy a 4 board set, two sets of trestles (you'll need them for stability, the 4 board size trestles wont give you that kind of stability), and a Magnesium straight edge. Aluminum will mar some wallpapers. I like to put lead tape under my straightedges for extra weight. The more the better. My straightedges weigh at least twice as much as they did when I bought them.
Now, if you want to make your own boards, go whole hog like I did and make them out of laminated pine. I used cherry strips for the breadboard ends, mortise and tenon style. I laminated 3 narrower boards to make each of the 4 boards. Here are three of them in the photo, right before I finished them with Draw Tite.
Linear Mode
