Sign Shops - Stoneskies/Stoneskies GitHub Wiki
Making a Sign Shop
First line can be either [Buy] or [Sell] depending on whether you want people to buy stuff or sell stuff to your shop
2nd and 3rd lines can be anything you want, though it's preferable you show a description of the item.
4th line is the price, for example 10
for 10 gold ingots
After typing out the sign, punch it with redstone dust and punch the chest you have the amount of what stock you want to sell, then afterwards you can add the rest of your items.