Coro Signs are a great inexpensive alternative to longer lasting heavier duty signs like those made from aluminum. These are plastic that have channels built within. These signs can be mounted on metal wire stakes so you can place them in the ground along side roads. These are also the same type of signs that you see during elections with candidates names written on them. These particular signs are also very popular with real estate and apartment communities. They come in many different colors but the most basic and common is white.
Signs made from PVC are solid 1/8 inch flexible plastic. These are used indoor and outdoor for much of the same similar uses as coro signs.