Here is the Corn ETF:CORN with March Corn overlaid in Lt. Blue. This ETF can be traded within most any stock account including most retirement accounts. Most commodity trading accounts are made up with limited funds and use high leverage and get used up quickly with any trade. An ETF of a commodity can be traded in a stock account where most traders have far more funds and far less leverage to get themselves in trouble with. They track about the same price wise. Only issue is volume and most commodity based ETFs tend to have low volume.