Wheat, corn, soybeans, beef, pork, chicken?
It's important to understand the distinction between "price" and "cost." The price of something represents the amount of money you must pay to buy it. The cost of something is the value of it when you compare it to alternative uses of the capital and labor used to produce it.
U.S. agricultural products are "cheap" because U.S. farmers are heavily subsidized. When you factor in the cost of a $150 billion Federal farm bill, your loaf of bread costs a heck of a lot more than the $1.99 you pay at the supermarket.