PVC is a kind of plastic pipe, which is often used in pipeline engineering. In all home improvement stores, PVC pipes are very cheap, quite easy to work with, very durable and very light.
PVC is the favorite of handcrafters. If you want to build something and save some money, here is a collection of the best awesome PVC projects for your homestead.
5. PVC Tomato Cages
(DIY instructions: Instructables)