Maggie, you might go in your local plumbing supply store and ask them. I sell to many plumbing supply stores and have heard them gripe many times when a plumber comes in bragging about how he has ripped off a customer. They know, or should, that a bad experience with a plumber just sends more people to the Big Box stores for do-it-yourself plumbing supplies so most of them want to support the reasonable plumbers in their area. At the same time, a plumber wants to make a living too. He has to pay for a store, top quality tools, advertising and many other things that you don't think about. His time, skill and experience is really all that he has to sell and he deserves to be paid for them.