Comic Book Boards? TIP

In a recent Forum post, Deepovertone asked: 
"I'm looking to find heavy card stock like the stuff Estes uses for their centering rings. Does anyone know a good source for stuff that heavy? Thanks." 

KJohnson responded:
"Comic book boards. You can get 100 for $12 at Walmart. Cheaper other places, YMMV. These are typically 24pt (.024" thick) cardstock. Can be laminated for thicker parts.

Mat board thickness varies by brand, but is usually somewhere between 40pt and 50pt (.040" - .050" thick) for 4 ply board." 

I have bought comic book backing boards before and are a good dense card stock. These could be laminated (two layers for .50" thick stock) for making centering rings.

Here's one online source: CLICK HERE