Buy Corrugated Plastic Sheet for Indoor and Outdoor Use - 4 Mm Thick Poster Board, 24x36 Inches - Pack of 2 White Plastic Board Sheets - Waterproof Coroplast Sheets and Lightweight Blank
Sibe-r Plastic Supply SM 5 Pack WHITE Corrugated Blank Sign - Etsy UK
4mm White Correx Corrugated Fluted Board (420mm x 297mm / A3) : Amazon.co.uk: Home & Kitchen