JayCee,
You can get the the discs from polywad. They are just plastic. An inexpensive way to go would be to get a lee loadall 16 ga loader for resizing and priming. If you shoot the same gun you do not need to resize. You can prime with the lee or a priming tool. An inexpensive roll crimper and the componets shot & wads from any number of places and you are set to go. I might even have a spare 16 ga roll crimper.