The last time I went to our big box hardware store for it, PVC was very expensive, and a lot was sold out. I get it though. My counter offer would be to replace all the piping if the thing ran all the time. With it never running, seems overkill to redo it all, especially for a weekend warrior. My two cents. Course every 3-5 years I pay a guy to essentially drill out our iron pipes from the 70s to the street at the first signs of slow drains… so maybe I’m not the best option.