If you were looking for the worst possible thing to put in your bore for wadding, Styrofoam would right up there near the top of the list. The stuff melts easily and will make one heck of a mess in your bore. Duro-Felt is not all that expensive and it makes an excellent wad for your gun. If you don't want to spend any money, look for egg cartons made from pressed paper pulp. Each carton will give you a few wads. Tell your neighbors and friends to save them for you.
But, if you want the best, buy several sheets of Duro-Felt, pre-lube it by spreading lube on it like buttering toast and put it in the microwave for a few seconds until the lube is melted into the felt. Then use your punch to cut out the best and cheapest high quality pre-lubed wads you can get.