OPTIX 30 in. x 36 in. x 0.093 (3/32) in. Clear Acrylic Sheet MC-06 - The Home Depot
Amazon.com: MyLifeUNIT Tracing Paper for Drawing, Translucent Vellum Paper 8.5 x 11 inches, 100 Sheets
Plexiglas 48 in. x 96 in. x 1/8 in. Clear Acrylic Sheet MC4896125 - The Home Depot
Amazon.com: Paper Junkie 100 Sheets 8.5 x 11 in Translucent Vellum Paper - 93gsm/63lb Printable Tracing Paper for Invitation, Sketching and Card Overlays
Clear 8.5" x 11" Vellum Paper by Recollections™, 100 Sheets | Michaels