Last year, I began using what I call an "Anti-CBS pad" which is nothing more than one-third yard of WarmWindow. That product is prohibitively expensive at $20 to $30 per yard. It's got a covering on only one side.
Wiggys has a more affordable quilted window covering, which costs $9.50 per yard. It's covered with a washable cotton-poly blend on both sides, making it an inexpensive way to use Lamilite in DIY experiments. All you have to do is cut it to the shape you want and bind the edges.
I'm about to order some of the Wiggy's product to make a top quilt... might also make a Mountain Man insulated blanket coat.