Since touching their respective closing highs between mid-November and the first week of January, the iconic Dow Jones Industrial Average, widely tracked S&P 500, and growth-dependent Nasdaq Composite have plunged as much as 19%, 24%, and 34%. While the Dow came within a bad day of ending in bear market territory, the S&P 500 and Nasdaq were firmly entrenched there. If there's a silver lining to the worst first-half to a year for the S&P 500 since 1970, it's that bargains abound for patient investors.