Put the item(s) you want to buy/sell, per transaction, in a chest.
Put a sign near the chest.
Put [Buy] or [Sell] on the first line.
Fill out the second and third line. It can be whatever you want, such as a description of what the shop contains!
The fourth line is the amount you’re buying/selling the item for.
Link the chest and sign by punching the chest with Redstone Dust, then the sign!
Tips
Left-click on an existing shop sign for a detailed view of what the shop contains.
The [Buy] or [Sell] indicator refers to the action of another player. For example, if you want to make a sign for someone to buy watermelons, you would put [Buy] at the top of the sign. If you want to have players sell their watermelons to you, you would put [Sell] at the top of the sign.
When you link the chest and sign, only have the exact number of item(s) you want to sell or buy for each transaction (such as a music disc, 5 cod, or a full set of diamond armor).
If [Buy] is blue, the shop is in-stock. If it is red, it is out-of-stock. If you’ve just restocked the shop and it’s still red, left-click on the sign to update it.
Once sign shops have been created, they cannot be edited. You must remove the shop by breaking the sign and recreate it.
One chest can have more than one shop. If you want to do that, ensure when you link the chest to each shop sign, the chest only contains the item(s) for that shop. After the signs are linked to the chest, then the different items can be put into the chest.
To remove a sign shop, simply break the sign.
Barrels can be used for sign shops as well.
[buy] and [sell] are valid casing for the first line as well.
When interacting with a sign shop buying or selling redstone, you will need to hit the sign with another item or an empty slot.
Screenshots
Redstone Starter Kit Example
Chest/Barrel with items for a transaction.After punching the barrel with redstone, the barrel with the items is “stored”, and punching the sign with redstone makes the shop and locks the barrel.After punching the shop sign to view the shop’s info, the player can buy 1 Iron Door, 3 Repeaters, 1 Lever, and 16 Redstone for $75.Contents added to the barrel after shop is set up.Shop info changed.
Mall Music Disc Example
The chest currently has 4 mall music discs.The shop is already set up. Punching the sign to see shop info. The shop contains 4 music discs and for each transaction, the player can buy 1 for $350.Punching the sign to see shop info. The shop contains 4 music discs and for each transaction, the player can sell 1 for $100. This is using the same chest as the buy shop in this case.
