I modeled my DIY set after these which you can see cost $180: Agility Weave Poles, Bases and WiresHow much do these weave bars usually cost if I wanted to get one at my house? Not too much I wouldn't think?
Doing it myself, they probably cost me about $100. They could of course be built much cheaper if you decide to build them from PVC. The issue with PVC is that they are super light and a dog with any kind of drive at all will push them around. You can see that happening here:
Two x Two Weave Pole Training
Personally- I say don't waste your money on PVC ones. Just build or buy steel based ones.