Hands down, the cheapest way to fence in your yard is by using one made of PVC. These fences use PVC to replace wooden stakes and pickets, and although not nearly as sturdy, they can certainly serve their purpose. The posts are PVC sleeves that go on top of wooden posts to add stability to the fence, but also cut down on material costs by using less wood. This type of fencing comes in a variety of different heights and colors. Because of its PVC makeup, the fence is very resistant to the elements and can last for years.