posted
Depending on where you're at, Home Depot and Lowe's both sell foam board for cheap. Also try any of the local building supply companies. I have found that the pink board is the best, but that is only made by Owens-Corning, and is pricier than the rest. As long as the layout isn't moved around too much, anything other than bead board will be fine.
Printer-friendly view of this topic
