I am a *huge* fan of weird old hardware/electronics/plumbing stores. The kind where there's probably asbestos in the flooring, the ceiling tiles are stained from leaks, there's a big ol' fan running in the corner cuz there's no A/C, and behind the counter sits a proprietor aged anywhere from 65-85, eager to help you with your household repair dilemma.
These places are few & far between, but my town has one, in the form of Larry & Joe's Plumbing Supply on Corbin Avenue in Northridge.*
If you need a plumbing part, I strongly encourage you to give these folks your business. If they don't have what you need, they will tell you how you can get it.
And, they have phone cords! And a Bag O' Nails! And a RainJet elbow assembly dated 1984!
*please note that Larry & Joe's does indeed have A/C!