I’m just going to do this as a list. I find that the lesser known companies have better prices than your Restoration Hardware or Rejuvenation, but there, I’ve mentioned them too. Some of these sites sell antique hardware as well as reproductions. If you’re on the lookout for historically correct doorknobs, switch plates, hinges or drawer pulls, these are the places to hit.

Ed Donaldson
Van Dykes
Signature Hardware
Kennedy Hardware
Paxton Hardware
Historic House Parts
House of Antique Hardware
Renovator’s Supply