OBA Parts Suppliers

After looking at the local hardware stores, I realized the pices and parts needed to complete my OBA setup are not readily availible. I need the smallest parts like a check valve, pressure switch, etc. Been to Harbor Freight, I want to check out a few other sources than Kilby Enterprises who are great, but I would like some place relatively local to run in/out of. Unfortunately TeamRush is no longer avilible to buy his goods, which I am sure I would not need to return.

So, the question is, what othe type of stores should I look for this stuff, and does anyone know of a good place in the east/south Bay area CA?

TIA