Even though the stock market is at record highs, there has been plenty of volatility in recent months. But with vast price swings in the markets comes buying opportunities. That's the assessment from Morningstar's Matthew Coffina, who says the deals to be found in today's market largely stem from companies that have been hit hard by falling oil prices, which have hit a five-and-a-half year low. He says: 'As of mid-December, the median energy stock in our coverage universe was trading 27% below our fair value estimate, making energy the cheapest sector on that measure by far.' Morningstar analysts think that the drop in oil prices is only temporary and maintain a $90 long-run price target for West-Texas Intermediate, the U.S. benchmark for oil and $100 on brent, the worldwide oil benchmark. If oil makes a dramatic recovery, the bruises plaguing energy stocks in recent weeks should heal.