Hi Ruth, Just got the following information:

To order polyethylene sheets call the Sabic Company Polymer Shapes, 2250 Zanker Rd., San Jose, CA 95131

Phone #: 408 432 3800.

When ordering ask for low density polyethylene sheets. The dimensions per sheet are 48" x 96" x .06"

The cost per sheet is $18.50. Shipping, which is extra, can be either rolled or flat. Shipping rolled is much less expensive and does not damage the material.

The sheets may be ordered cut into smaller sizes but expect a shipping delay of 5 days.

Joe