Sheetrock brand Ultra light gypsum panel Eco blueprint Brand new, bought too much. https://www.homedepot.ca/product/cgc-sheetrock-1-2-in-x-4-ft-x-8-ft-ultralight-mold-tough-drywall-panel/1000152285 $25 each (retail for $26 plus tax, save taxes) Or 5 for $100.