Source For Styrofoam Packing Inserts

Google -  No experience with these folks but maybe call Uline and ask them if they have what you need. There are other companies

There are a number of brands of expanding foam bags that will… well, create foam and conform around whatever you are packing. You would want large ones. Amazon has a number of them. I would search google to find the right size.

Probably a long shot but you could try contacting PSB dealers or the national distributor. Normally the packing is necessary until delivery, then most owners want to keep them.