I purchased my Owens Corning 703 at a local Insulation Distributor that sells to contractors. The box came 12 panels which are 2ft x 4ft x 2" thick. It was about $120 bucks for 12 panels. There are some websites online where you can buy these panels, I can help you out if you need it.
For corner traps you can do it two easy ways.
Option 1: You can just stradle the corners with the panels without cutting triangles, takes less material. If you use 2 panels placed togethor to make 4" thick, it works great for a bass traps. So it would take a total of 4 panels to go from floor to ceiling. You would just build a couple of frames, place two panels in each frame, wrap with material, and hold the panels up with picture frame hooks/wires so they stay in place.
Option 2: Cutting triangles. There are two patterns you can cut out of a 2ft x 4ft panel. One makes triangles that are 24" x 24" x 34" which are much bigger than the ones I did, you only get 4 triangles out of each panel. I cut those triangles in half again, which gives you 17" x 17" x 24" which is still very big and takes up less corner space. In talking to people from GIK and Realtraps, I was told it would do a great job, slightly better than just stradling the corners with panels.
I basically put up a couple of 1 x 2's on the wall and attached some felt with velcro to the wood. The hard part is once you start stacking these triangles they like to fall over when they get real high, so it was a little tricky when your talking 8-9ft high.
I've been thinking about building a couple of 4ft high frames out of wood in the same shape as the triangles, only slightly bigger to hold the triangles, and then cover with a material. This would look like the GIK Tri Traps that BrotherBob purchased.
