Every week, I always choose to get some information in CME GROUP website, I can get a lot of instant information there such as daily chart, quotes and so on. And this is a very authoritative site.
Also, I always willing to go to business recorder website. In this website, I can get some new policies, news, even some predictive information there. I think it is very useful .
http://www.brecorder.com/markets/commodities/america.html
In this week, I also go to index mundi website to get some data there to help me to make the right decision, such as I can get past 10 years soybean price there. We know that the historical data is also a key to the success, it is very important to help us.
http://www.indexmundi.com/commodities/?commodity=soybeans&months=120