Devon Energy, UPS, and nVent Electric all have their fair share of challenges, but their valuations are simply too cheap to ignore. The S&P 500 and Dow Jones Industrial Average are less than 1% off their all-time highs, while the Nasdaq Composite is off by less than 5% from its peak. And yet, there are still plenty of stocks that are trading far below their peak prices, and many that have lost ground so far this year. Among those stocks are oil and gas exploration and production company Devon Energy (DVN -0 ...