If you're needing quite a bit of it, I ordered mine from
www.cutcardstock.com. I'll have to find the brand that I ordered:
50 pk Curious Metallic 92 lb Cardstock
8.5 x 11
$16.00 1 $16.00
Customizations: Galvanized
This is what I ordered for silver and it was because of this site (SCS), someone else tested or knew that this is the same as what SU sells. Just thought this would help if you need more than the pack that SU sells.