I have got few useful websites for the trading game.

http://www.cmegroup.com/trading/agricultural/

The first one is the CME group. This website shows all the prices of traded commodities as well as agricultural products. The CME group updates the price more frequently than the trade sim does, the website we do trade. CME also provides a change between the settlement price and the previous price. Price and trade volume charts are shown graphically, so, it is easier to understand what is going on.

http://www.usda.gov/wps/portal/usda/usdahome

USDA provides collective links of current agricultural news and research, climate change, and national grain reports. There are tons of reports on the website, but the report on the national grain market summery is useful for checking the flow of grain market day by day. Using this summary will be helpful to read trends in national grain markets and predict whether the grain price will go up or down.

http://www.apk-inform.com/en/news

This website includes current agricultural news and harvest and export reports of Ukraine, Russia, Kazakhstan. The news posted on the website shows what is happening and how this can impact on these countries to trade.  The report from the website also shows changes in harvested and exported amounts.  Ukraine, Russia, Kazakhstan are large exporters of wheat. So, if you are interested in Wheat trade, this website will be useful and helpful in predicting the future prices of wheat and guides you to choose good initial positions.