While the proven Zacks Rank places an emphasis on earnings estimates and estimate revisions to find strong stocks, we also know that investors tend to develop their own individual strategies. With this in mind, we are always looking at value, growth, and momentum trends to discover great companies.Looking at the history of these trends, perhaps none is more beloved than value investing. This strategy simply looks to identify companies that are being undervalued by the broader market. Value investors use tried-and-true metrics and fundamental analysis to find companies that they believe are undervalued at their current share price levels.Luckily, Zacks has developed its own Style Scores system in an effort to find stocks with specific traits. Value investors will be interested in the system's "Value" category. Stocks with both "A" grades in the Value category and high Zacks Ranks are among the strongest value stocks on the market right now.One company to watch right now is Best Buy (BBY). BBY is currently sporting a Zacks Rank of #2 (Buy) and an A for Value. The stock is trading with a P/E ratio of 12.66, which compares to its industry's average of 14.48. Over the past 52 weeks, BBY's Forward P/E has been as high as 15.05 and as low as 10.64, with a median of 12.45.Value investors also love the P/S ratio, which is calculated by simply dividing a stock's price with the company's sales. Some people prefer this metric because sales are harder to manipulate on an income statement. This means it could be a truer performance indicator. BBY has a P/S ratio of 0.46. This compares to its industry's average P/S of 0.56.Value investors will likely look at more than just these metrics, but the above data helps show that Best Buy is likely undervalued currently. And when considering the strength of its earnings outlook, BBY sticks out at as one of the market's strongest value stocks.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Best Buy Co., Inc. (BBY): Free Stock Analysis Report To read this article on Zacks.com click here.