American Made Signs carries 18" X 24" coroplast for $3.50 each ($4.50 for colors) and 4' X 8' Sheets for $21.00 each ($23.00 for colors). We keep White and some Yellow in stock, however more colors are available. Sizes can be cut down to your preference. We have 2mm, 4mm (Standard), 6mm and 10mm. Shipping is available. 4' X 8' sheets can only be delivered on the East Coast due to the cost. Cash, Check, Credit Card