check out this company
http://www.customlaminations.com/Window_Treatments_drapery.html

carolyn

Thanks Carolyn! I wish they had pricing on there. It sounds expensive.

Hi; Go to Joann's Fabric and ask for under pad for a table. It is a quilted fabric and comes with and without a vinyl backing. It's usually 60" wide and you have them cut the length you need.

Bonnie

Another option is to check out the thrift stores in your area. I recently purchased a pair for $1.50 that were like new. I'm removing the pinch pleats so I can make a casing for a regular curtain rod. I wanted the insulated ones to help block out the afternoon heat from a west-facing bedroom window.

How about purchasing a flannel backed vinyl tablecloth and putting it under your good tablecloth?

JC Penney sells thermal drapes that have the backing you describe. Maybe the thrift stores have a panel or two.