SignShops

this link has all the information you need to know about sign shops.
dev.bukkit.org/bukkit-plugins/signshop/

Players here can use a Wood_axe to destroy signshop signs.
Players here can only use these signshops:
[buy] Buy an item from the shop chest for the price specified on the 4th line
[sell] Sell an item to the shop chest for the price specified on the 4th line
[jukebox] Allows players create jukeboxes by placing music discs in a chest
[usercommand] Allows players to run commands on the 2nd and 3rd lines of the sign as if they typed it themselves
[share] Link to another SignShop to split profits, lines 2 and 3 are for the other players, line 4 is for % amounts (e.g. "25/50" for 75% to others)
[bank] Link to another SignShop to make the shop take/give money to a bank account, The bank account is specified on line 2 of the sign (Note: you must own the bank account for this to work)
[donatehand] Donates the item in your hand to the shop chest
[device] Temporarily turns on a lever

Max singshop sign and chest distance = 20 blocks