It depends what you want. The original trademark 'vet bed' is woven in a way that allows moisture through only one way so the animal stays dry if it has an accident. I would think this reason and it's trademark name is why it is expensive.
In a home environment it probably isn't needed to this degree. There are lots of similar products which do just as good. If you plan on going to a county show with a dog show this year you can often buy a roll of material. Or do as I've done, find a large craft store or haberdashery near you that you can check the quality and order off the roll per metre.