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Chris,
Polystyrene (Styrofoam) Sheets can sometimes be purchased at Building supplies, or Insulation companies but cheaper from a manufacturer. If you have no luck, signwriters have it as they cut foam signs out of it! (they probably charge more though).
The product from Building supplies and Insulation companies might be better than the signwriter version as it is often lined on one side with silver foil for extra heat reflection.
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