I may be coming late to the party, but finding this thread was what I needed. I have some Styrofoam to cut indoors and wanted to avoid the mess. I went to Menards, Home Depot and Farm & Fleet and could not find these blades, also I have a Craftsman saber saw and the Bosch blades probably would not fit. I did happen to find some knife edge blades for my saw on Ebay, but thanks for the tip on the type of blade, I didn't know they existed.
Ray