I used this for printmaking to make drypoint etchings. These are acrylic sheets called Optix by Plaskolite. They are .080" thick and are 20 times stronger than glass and easy to cut. A pack of 10 sheets of 30" x 36" (inches) is 268.23 which equals 26.82 each and I have 2 sheets cut up into smaller sizes for sale. They still have the protective film on them too to prevent scratching)
SIZES:
x2 - 6 1/2" x 11" (inches)
x3 - 15" x 18 1/4" (inches)
x1 - 4" x 18 1/4" (inches)
x1 - 6" x 20" (inches)
x1 - 12 3/4" x 18" (inches)