I was introduced to Shrinky Dinks at Bella's house before Florida Rat Camp. I never had them as a kid or I don't remember having them. Anyway, they make Shrinky Dinks that can go in your printer! And they work. This was a trial run (you can see some paper got stuck on the front so I know what not to do) but I am pretty happy with this idea. :)
The SD sheets can be ordered here.