These underappreciated dividend payers offer yields above 4% at recent prices.The past year has been terrific for most stocks. The S&P 500 index rose 27.5% during the 12 months ended Aug. 26.It's always nice to see the value of your portfolio rise during a bull market, but it also makes it hard to find stocks to buy at reasonable valuations.Investors seeking reliable dividend stocks that still look like bargains will be glad to know that not all of the S&P 500's components have had a great year. Pfizer (PFE ...