Corrugated Plastic Yard Signs are available in a variety of sizes to fit your application. 24" x 18" is the most popular size. This lightweight weather-proof material is very strong. Each size below has vertical flutes and can easily be mounted on our standard Sign Stakes (sold separately). Double-sided printing is available for a small additional fee. Corrugated Plastic material is available in White or Yellow for the same low price. 36" x 24" and 24" x 24" are only available in White. Yard Signs with Free Shipping.