I found some cheap silver cardstock at Office Max. I was able to get 30 sheets for $1.20....great price really. I went to the copy department and asked the guy who said they could sell by the sheet.
Here is the info I posted about it in Will's thread when I was looking around town here to get metallic type paper for the XP-72. XP-72 Super T-bolt
I have a shot of it a couple posts down also. Then if you go to post 184 in that thread, Billy posted photos of comparisons of Red River stock with this silver cardstock I have.
Then, if you click on the link in my signature, you will see the cardstock on the model starting in post #13 and other shots further down in #19, 20 and 21.