I just picked up some very similar Wausau "Metallics Cardstock" packs from OfficeMax the other day - 10 65lb sheets for around $7 - quite a bit more expensive than what you found per sheet, but a smaller pack to play with. I got the silver and the white that looked like printing a gray on would give a nice hint of shine for a silver, and not detract from markings. I'll find something to print on it and test it out once I get my printer fixed. Maybe this Marek MiG-15 I've been meaning to print...
