Automatic Price update from Live prices

Is there any plugin or script by which gold & silver prices on my site will automatically update on daily bases means there are many sites like http://www.kitco.com they are providing live updated price so i want in my site that live price of kitco.com will apdate automatically on daily bases by adding my profit margin.
Please reply me for same on irfan_khan@paarami.com
Waiting for your kind reply...