Here at Zacks, we focus on our proven ranking system, which places an emphasis on earnings estimates and estimate revisions, to find winning stocks. But we also understand that investors develop their own strategies, so we are constantly looking at the latest trends in value, growth, and momentum to find strong companies for our readers.

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 a variety of methods, including tried-and-true valuation metrics, to find these stocks.

In addition to the Zacks Rank, investors looking for stocks with specific traits can utilize our Style Scores system. Of course, value investors will be most interested in the system's "Value" category. Stocks with "A" grades for Value and high Zacks Ranks are among the best value stocks available at any given moment.

One stock to keep an eye on is Priority Technology (PRTH Quick QuotePRTH - Free Report) . PRTH is currently sporting a Zacks Rank of #2 (Buy), as well as an A grade for Value. The stock has a Forward P/E ratio of 14.03. This compares to its industry's average Forward P/E of 40.84. Over the past 52 weeks, PRTH's Forward P/E has been as high as 22.72 and as low as -4,545.91, with a median of -16.29.

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. PRTH has a P/S ratio of 0.89. This compares to its industry's average P/S of 1.65.

These are only a few of the key metrics included in Priority Technology's strong Value grade, but they help show that the stock is likely undervalued right now. When factoring in the strength of its earnings outlook, PRTH looks like an impressive value stock at the moment.