I've kicked myself for not buying a stock sooner more times than I'd like to admit. Even worse are the stocks I should have bought but never did. If you invest long enough, you'll no doubt feel the same way at times.

The way to avoid this regret is to identify good stocks to buy before everyone knows they're good stocks to buy. That's easier said than done, of course. However, I think (NYSE: PFE) qualifies as a good stock to buy right now, even though some investors might disagree. A few years from now, you'll wish you had bought this undervalued stock.

Make no mistake about it: Pfizer is undervalued. Shares of the big drugmaker trade at a forward price-to-earnings ratio (P/E) of 10.1. The S 500's forward earnings multiple of 21.5 is more than twice as high. The S 500 healthcare sector is much more expensive, as well, with an average forward earnings multiple of 19.9.

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Source Fool.com