So...found this foam by accident at the $store.



It's a 6mm (or maybe a bit thicker) foam that appears to be XPS like Model Plane Foam.  $2.50 CAD for a 20 X 30 sheet.  Seems to be pretty equivalent to my MPF.  Only annoying thing is one side is painted but I'll have to go back and see if they just have white.


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