apartment therapy changing the world, one room at a time

Look for commercial door knobs. I've seen them at Lowes.

try hundley hardware at 617 bryant st. [between 4th and 5th streets].

Bauerware on 17th Street at Noe has the best cabinet hardware...I would think they'd carry knobs as well. Don's Lock on Mission (at Valencia) also has a wide selection.

You might also try eBay. I replaced all the doornobs, henges and other hardware in my house -- all from eBay sellers. All were at a fraction of the price I would have paid at a hardware store or online. All were new, in original packaging and good brand names.