The Freedom Pen Project has their own forum over at Sawmill Creek. All the details are in there, but the short version is.... Corning donated several tons of red and blue corian to the project several years ago. They (the FPP) will ship anybody who wants to pay shipping a flat rate box full of red and blue industrial trimmings (they are irregular, but all at least 1/2 inch thick. The person who administers the project will include an equal amount of white in the box from their personal stock. A flat rate box is about 30 pounds and would make (I'm guessing) several hundred pens. The FPP also sells slimline kits at about $1.25 per (for use in the project) They ask that finished pens (of any sort, not just corian) be sent back to them for distribution to active duty military personnel overseas. There are several private parties sending pens to the troops and while this is not really approved by the project, they ask to be notified via email if their materials are used and delivered this way, to help document usage of donated materials and maintain their non profit status.
I took it upon myself to make up a few flat rate envelopes of red white and blue material and mail it out to people who were interested in sending some pens to the troops, but didn't need 30# of the stuff.
Here's the link to the forum.
http://www.sawmillcreek.org/forumdisplay.php?f=17
The material will need to be laminated (if desired) cut to size, drilled and turned for whatever pen kits you are willing to donate. Slimlines can be drilled and turned from a single thickness of the material with a little care. Most anything larger would need to be glued up (I use thick CA and clamp flat sides together for about an hour, then cut, round over, drill and finish turn). Thinly turned corian is somewhat brittle, and care must be used assembling finished pens. It may also crack later if temperature fluctuates greatly, but in general it is a fairly stable and durable pen material.