BOSTON ( TheStreet) -- With crude oil approaching $90 a barrel, driven by the economic recovery and the weaker dollar, energy companies are racking up profits. Still, there are bargains in the sector. Here are the 10 cheapest oil and gas stocks in the S&P 500 Index, based on forward earnings. The S&P 500 sells for a forward earnings multiple over 14. These energy stocks are cheaper than that. Below, they are ordered from cheap to cheapest.