http://www.jameco.com/z/PROTO-DOUGH-100 ... 08307.html
I get emails from these guys because I bought my heavy balled mice from them.Now you can mold and re-mold your own custom designs as many times as you want! Just drop it in hot water and it allow it to melt before letting the cool down to be molded into a brand new shape. With this design thermoplastic, anyone can safely hand mold sculptures, figurines and shapes of all sizes.
Drillable and machinable
High elongation points
Melting point temperature: 136°F to 140°F (58°C to 60°C)
Pellet size: 3.5mm (0.14 inches)
Weight: 250 grams (0.55 lbs.)
Safe for hand molding
Usually its misc electronics, but this time it was interesting.
I havent tried it, just got the email today.