Can't find a certain shop plugin

There is a plugin that I have seen on a server that I can't seem to find anywhere. Basically to make a shop you lay down a chest and put a sign above with [ dirt ] or [ stone ], etc on it and you have a shop. Right click the sign and it says "You can buy 32 dirt for 1 gold. You can sell 64 dirt for 1 gold. This is an infinite shop" Does anyone know the name of this plugin? I have search everywhere. Any help would be appreciated.

-Tray

Tradecraft.... Sorry for the waste of vertical space..

EDIT by Moderator: merged posts, please use the edit button instead of double posting.