Many of the tools sought by blacksmiths have not been made for over 50 years. You will not find them at your local hardware store, rarely at antique shops or anywhere else. Most of these items are in the hands of individuals or subject specific dealers or "tailgaters". These tailgate dealers can be found at various blacksmithing events or on-line. Their skill at finding rare items is a combination of personality, persistance and practice. It is a skill worth paying their markup on the things they find. See
How to Find Anvils for details.