UPDATE. The link for the image is now available here: http://www.mediafire.com/?9cus1a0b3hcg48x
This tutorial shows how to make one for a few bucks if anything at all, as the materials are pretty common.
The initial idea was found on StevesForums.
Step 1: Gather the tools & materials.
1. DVD Case (AOL does come in handy).
2. Thin (flexible) plastic binder. Both plastics may be substituted with heavy (but thin) cardboard/matte-board.
3. Adhesive spray or fixative. Artists adhesive works, but I found that carpet adhesive works much better as it is more flexible.
4. Small piece of aluminum foil.
5. The CD Disk Tray template (right-click, "Save Link As").
The tools are as follows:
1. Razer blade.
3. Band-aids are optional but come in handy when the razor gets your finger. Trust me.
Step 2: Prepare the top layer.
Print the Disk Tray Template out on plain paper but be sure you print at the actual size! I put the measurement in cm on the tray so you can tell if it is true-to-size once printed.
Spray a bit of fixative on the plastic and adhere the paper to it. Be sure the paper fits the plastic and doesn't overhang on either side. It is okay to overhang at the bottom (see picture).
Next spray some fixative to the paper and stick an old CD/DVD to it. You may use the template (cut INSIDE the line, not ON) but I find that tracing a disk is easier than tracing a line.