Acrylic Sheet, Clear - 3.18mm Thick (1/8 Inch) x 25cm Square - Radiation Products Design, Inc.
Amazon.com: 24 Pcs 12 x 8 Inch Colored Acrylic Sheets 0.08 Inch Thick Acrylic Sheets for Laser Cutting Opaque Acrylic Panel in 12 Colors for Laser Cutting Engraving Cutting It's Not Cast Acrylic Sheet
Clear Plexiglass Acrylic Sheets 1" Thick
3/8"-Thick 18" x 48" Clear Cast Acrylic Plexiglass Sheet