Each fish barrel always contains at least 1 Salt Pile. Other barrels and sacks containing raw food also have a chance of containing Salt Piles. You can also visit the merchants in inns and alchemy shops for Salt Piles. Almost all of them are guaranteed to have 1-6 pieces of Salt Piles in their inventories. There’s also an exploit where you can reset merchant inventories to get more Salt Piles (which we’ll cover in more detail below).
Riften Docks and Fishery
The Riften Docks has 7 fish barrels and each barrel has a chance to contain Salt Piles. The boat has 8 fish barrels, so you can also try and look here. Inside the Riften Fishery are another 4 of these Fish Barrels. Taking these Salt Piles (or any other item) will count as theft, so it’s better to befriend the Argonian named Wujeeta at the docks. Give her a healing potion and you can loot these barrels safely.
Merchant Exploit
If the Salt Piles from the docks and fishery aren’t enough and you need even more, a merchant exploit can be used. This method will reset the merchant’s inventory even if you bought all of their items. The method for this exploit is as follows: There’s also a way to do this using cheats if you’re open to that too.