I've made some cheaply by cutting open the bottoms of some stuffed animals, removing the stuffing, and gluing a circle of cardboard with a fold in the middle of the mouth (on the inside of the puppet's mouth).    Also, save rods from broken umbrellas. They form a "Y" with a long piece hinged to a short piece, and have small holes near the ends.   There are usually 8 available from a broken umbrella. Cut off the bottom of the long piece below the hinge and sew the other two ends (using the small holes) to the puppet's hands to manipulate as a rod puppet, using a single hand inside and a single hand outside with your hinged rods made from the umbrella.