It's not fun to see your portfolio lose value, but market corrections can lead to rare opportunities to invest in undervalued companies before their share prices rebound in the next bull market. While there are still headwinds in the economy that could weigh on stocks in the near term, a new bull market is coming (if not already here). If you have spare cash and want to add deep value stocks to your portfolio to boost your returns, here's why you might want to consider Williams-Sonoma (NYSE: WSM) and Qurate Retail Group (NASDAQ: QRTEA).