The elusive pink foam sheets

[Cal_Newbie]

OK... given that Owens Corning is by no means a small corporation, or having a poor distribution system........I have spent my entire morning trying in vain to find this product. Home Depot & 5 other building supply facilities...all have something different and deny knowledge of such product. Anyone buying from a nation wide chain or can throw a clue this direction? Is this the correct product "FOAMULAR® rigid foam insulation" or "Owens Corning - Insulation - ProPink® Sheathing" There is apparently several different versions of this elusive pink board. If I can get the specific name then I can order it.

I do have a question about foam: given that sand will "give" and aid in reducing wrinkles in the liner, does the foam cause a problem or will it "give."

Bob-