3DFanatic

I paid $27 at Lowe's for the Bluecore Fanfold Foam. It's 4' x 50' folded to (25) sheets of 24" x 48". I haven't made the Ultimate yet...but you can easily make (1) 3dx per sheet.

That's only a little more than a buck a plane!

If you can find it...try to get the Blue Foam instead of the Pink stuff. It's lighter & stronger! Where I live, they sell the Blue stuff at Lowe's and the Pink stuff at Home Depot...

Good Luck...and have a BLAST!!!