Amazon.com: SimbaLux Acrylic Sheet Clear Cast Plexiglass 5” x 7” 0.08” Thick (2mm) Pack of 2 Transparent Plastic Plexi Glass Board with Protective Paper for Photo Frame Replacement, DIY Display Projects, Craft :
Amazon.com: DUGATO Round Clear Acrylic Sheet 4 inch Set of 12 Transparent Plastic Blank Disc Circle Sign Panel for Picture Frame DIY Art & Craft : Industrial & Scientific
Amazon.com: Icona Bay PET Plexiglass, Thin & Flexible Plastic Sheets (4x6 x 0.03 inch, Clear, 10 Pack), Easy to Cut for DIY Art Projects, Picture Frame Replacement Glass, PET Sheeting is Pliable