Check out this website:
www.sculpey.com for polymer clay, it keeps for a very long time!
I think it was about $15 for a a lb. brick, which comes in strips. You can roll it out, or roll it in your hands.
Once you receive your polymer clay, keep it in an airtight plastic bag, and use as needed. I just take out a bit, roll it in my hands, and shape into whatever shape I want to use, then bake it in the oven of your kitchen stove 275 degrees for 15 minutes, let cool, paint with acrylic paint let dry - don't forget to make holes in to sew it onto your project or before baking attach a hook on the back.......