Mylar is a polyester film/plastic sheet and comes in a variety of finishes. It's like what you see Easter baskets wrapped in. Here is a site with lots of mylar digitized designs.

http://bordadosaguasanta.blogspot.com/search/label/Mylar

I have yet to purchase any so I don't know the best place. I know other Cuties have so they should be able to help with you finding some for purchase.

I just got my order yesterday from Heirlooms by Sharon. It is great for Christmas 0rnaments or anything you want a shine too. I've been playing with it today on butterflies and flowers. Get some I think you will be glad you did
Bev

I to have bought at the dollar store and at a sewing store and the only big differece is the price 1 dollar or 10 you choose???lol carolyn