Bob
I bought very thin aluminum, shinny 1 side from a scrap dealer in Reno Nv. You use metal cutting blades, you can get them from the Flying Dutchman. You need to sandwich then between 1/8" baltic birch, and when i cut them i always stack cut them. The Place in Reno is S & S metals and i know he has more of these sheets 12" x 24". I believe he would ship them to you, they were $1.00 per sheet when i bought them a couple of months ago. I hope this help, and if you need additional info you can contact me.
Kenny