Step 1: Balance
-One sheet rigid foam insulation 2" thick. ($25) but really it was free from Swap, who gave me a bunch of sheets he didn't need. I added some extra scrap to make it unnecessarily a bit longer. Boys are funny that way...
-Two tubes of construction adhesive $6 (the large ones. You'll be cutting them open so don't worry about a caulking gun)
-A fine notch plastic trowel $1.50
-A wood rasp. Garage sale price. Who on Earth know$?
-An optional 1/4" sheet of plywood (left over from a $8 sheet) for decking.
-Lots of heavy things for glue pressure. Sandbags work fine.
Total cost for DDC was low. You can buy everything you need for less than $50. But you will agree that price is only a small part of the cost for makers. The real cost- the only truly limited commodity- is time.