My Styrafoam located inside my hot tub became very heavy and full of water. I took the foam out and want to replace it...Overall cover deimensions 76 1/2 x 76 1/2 I only need half the cover or 36.5 width x 76 in length and a thickness of about 1". Where can I get this if i live in NH 03051 Hudson, NH? What should i expect to pay? Can you size two pieces of that and ship overnite? how much? how long?