Regularly updated charts with current prices of oil per barrel are available on Bloomberg.com and OilPrice.com. These sites contain links to charts for sub-categories such as crude oil, natural gas, ethanol and heating oil.
Bloomberg.com lists the price of oil in U.S. dollars per barrel for West Texas Intermediate and Brent crude oils. Data for each oil type includes the price at the open of trading, the price at the previous close of trading, the range of prices for the day and the 52-week range of prices. OilPrice.com has a price chart for West Texas Intermediate crude which includes the open, high, low and close prices for the trading day and graph of price figures for the previous four months.