Polymer Clay Push-molds

I've been waiting for weeks for Michael's to put Sculpey on sale. Today it was .99, half the usual price. A few years ago I made some faces with a commercial brand push mold. Recently on line I read an article on how to make your own original push mold, so I've wanted to do that for years and I had to jump on the chance.

I can't find the site now, but here is another one: http://www.jaedworks.com/clayspot/polyclay-faq/molding.html