Prices run from $6 for a doorstop to $12,000 for an art deco ceiling lighting fixture, and everything is orderable online. Of course, they don't have everything online, but they have a good amount and it is very nicely laid out so you can find things quickly. MGR
Liz's Antique Hardware is a great resource for just the type of vintage hardware that New York apartments love. With a collection of more than a million pieces of salvaged hardware (circa 1850 to 1970), LA has hardware for doors, windows and furniture. They also carry lighting, bath accessories, and "other things that catch our eye."