The Commodity Marketplace interface is very simple, and can be frustrating to use if you make lots of different trades.
Supernova provides you with a Watchlist which will show you prices for all the different commodities you are interested in.
In addition, you can launch a Trade Ticket from the Watchlist which will give you a superior trading experience.
This Addon is under active development and more features will be added frequently. Please comment about any features you are interested in.