FYI - Insul-brite comes in 2 widths - about 22 inches and the standard 44 or so inches. The narrower one is about $2.50/yard and the wider one is about $5.00/yard. Which equals out to the same price (give or take a few pennies). Just depends on what you want/need. Nancy's Notions catalogue is $4.99/yard but you need to add shipping. I've purchased the narrower one from a quilt store. It also can be purchased in a pre-cut package but is lots more expensive this way (unless that's all you will ever need and will not purchase any more). Just do not use all poly batting - it conducts the heat (probably why the purchased ones don't always work well). And poly could melt.
IMHO the cotton batting plus insul-brite is the best way to go. I prefer to see pretty fabric on both sides so not fond of the silvery stuff. Think I'lll try to get over to Joann's (about 50 miles one way) and see if they have some - have a bunch of great coupons.
Sandy in Mooresville, NC