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.

Of these, value investing is easily one of the most popular ways to find great stocks in any market environment. Value investors use a variety of methods, including tried-and-true valuation metrics, to find these stocks.

Zacks has developed the innovative Style Scores system to highlight stocks with specific traits. For example, value investors will be interested in stocks with great grades in the "Value" category. When paired with a high Zacks Rank, "A" grades in the Value category are among the strongest value stocks on the market today.

Vitamin Shoppe is a stock many investors are watching right now. VSI is currently sporting a Zacks Rank of #2 (Buy), as well as an A grade for Value. The stock holds a P/E ratio of 6.42, while its industry has an average P/E of 16.17. VSI's Forward P/E has been as high as 142.12 and as low as -39.14, with a median of 22.20, all within the past year.

Value investors also use the P/S ratio. The P/S ratio is is calculated as price divided by sales. This is a popular metric because sales are harder to manipulate on an income statement, so they are often considered a better performance indicator. VSI has a P/S ratio of 0.09. This compares to its industry's average P/S of 0.24.

Value investors will likely look at more than just these metrics, but the above data helps show that Vitamin Shoppe is likely undervalued currently. And when considering the strength of its earnings outlook, VSI sticks out at as one of the market's strongest value stocks.