This retailer dominates its niche -- and its stock looks like a buy. With stock market indices like the S&P 500 and the Nasdaq 100 trading at borderline frothy valuations, there's a shortage of high-quality companies with attractive valuations. Nevertheless, there are still opportunities, as few and far between as they may be. One of the few exceptional brands investors can still buy today at a compelling valuation is Tractor Supply (TSCO 0.34%), the country's leading rural-lifestyle retailer. Not only does ...