we needed a new pad for the AC, so rather than a chintzy plastic one they use alot now, I decided to pour my own. cheap. $12.57 for the 36"x42"x3" pad. Couldn't even get plastic for that. (And now, we don't count the $x00 nail gun used in nailing the forms. Nor the $y00 cement mixer. Those are strictly optional tools but they have intrinsic (read back and elbow saving) value. :-)