How to Buy Smithing Stone 1 & 2
Smithing Stones are the upgrade materials in Elden Ring. They are used to upgrade weapons and shields. There is a total of 9 tiers of Smithing Stones in the game. The Tier of a Smithing Stone is represented by a number within the brackets in front of its name. Higher tier Smithing Stone is required to upgrade higher level weapons and shields.
You can purchase unlimited Smithing Sones 1 & 2 from Twin Maiden Husks Vendor in the Table of the Lost Grace. But you cannot do it straightaway. You will first need to find Smithing-Stone Miner’s Bell Bearing  to unlock Smithing Stone 1 & 2 for purchase. This guide shows where to find Smithing-Stone Miner’s Bell Bearing  to buy Smithing Stone 1 & 2.
Smithing–Stone Miner’s Bell Bearing  Location
Go to Raya Lucaria Crystal Tunnel, which is in Liurnia at the location marked in the pictures below.
Enter the tunnel and keep going down until you reach Crystalian Boss. Defeat Crystalian and it will drop Smithing-Stone Miner’s Bell Bearing .
How to get unlimited Smithing Stone 1 & 2
Once you have Smithing-Stone Miner’s Bell Bearing , go to the Table of the Lost Grace and give it to Twin Maiden Husks. Now you will be able to purchase Smithing Stone 1 & 2 infinitely for a certain cost.
Smithing Stone : 800 Runes
Smithing Stone : 1600 Runes