It's easy to get excited about stocks that are soaring at the moment -- and so you may be tempted to scoop them up and benefit from the momentum. In many cases, that's a great idea. But it's also a good idea to take a look at stocks trading at dirt cheap valuations. If you plan on holding on for at least five years, this sort of player could represent a huge growth opportunity for your portfolio.

Though the S&P 500 index has climbed in the double digits since the start of the year, many quality companies have been left on the sidelines. They've either declined or underperformed the index. But thanks to a solid financial situation and excellent future prospects, they have what it takes to deliver over the long run.

In fact, two e-commerce stocks fall into this category, trading at absurdly cheap valuations, and you can buy a few shares of both with just $500. Let's check out these top stocks that long-term investors should buy right now.

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Source Fool.com