Blacksmiths generally work with low to medium carbon steel ( usually just called "mild steel").
Bladesmiths work with medium to high carbon steel.
S30V is a high alloy stainless steel, which is not generally forged. It is also expensive.
For forged knife steels try 1084, 5160, 1070, 52100, 1095, W2, O-1.
All the knife suppliers sell knife steel. Many of us buy from Aldo Bruno, who's business is called the New Jersey Steel Baron.
For blacksmith projects, Lowes, Home depot, and Fastenal all sell mild steel. Blacksmith suppliers, like Smith and Keene and Centaur Forge, also sell some specific types and shapes of blacksmithing steel.