I'm looking for sources for rigid polyurethane (or comparable) foam for prototype/model/plug work - that will sell small quantities (like 1/4 sheets where shipping won't kill me - or located in South Fl where I can pick up). 3/4" and maybe 1 1/2" thicknesses - 6 lb or maybe 10 lb density.

I know that somewhere, probably locally given the marine industry, people have what I need as scrap! Finding them is another matter. Dealers I'm finding aren't really catering to small model/prototype order.