I personally like the AMS site.  The Nebraska Grain Elevator Bids report is quick and easy to read... uncluttered by any graphics.  I don't know if other states have AMS reports quite like this.

AMS state home page...

http://www.ams.usda.gov/AMSv1.0/ams.fetchTemplateData.do?template=TemplateS&navID=MarketNewsAndTransportationData&leftNav=MarketNewsAndTransportationData&page=LSMarketNewsPageStateGrainReports