Amazon (NASDAQ: AMZN) is firing on all cylinders, and Bezos' e-commerce behemoth will roll over any brick-and-mortar retailer that stands in its way... right?

Amazon's net sales in the company's first quarter were up about $2.02 billion, or 22%. Meanwhile, some brick-and-mortar retailers are struggling to grow their top line, and Amazon is likely at fault (or at least partly). Best Buy (NYSE: BBY), for instance, saw revenue decline 9.6%, and comparable-store sales fall 1.3% from the year-ago quarter. Amazon rival Barnes & Noble continues to face rough waters; revenue continues to slide, and the company's CEO recently resigned.

For brick-and-mortar retailers in Amazon's lane, all is lost -- or so it seems. Is there any hope for Amazon competitors? Possibly. Are brick-and-mortar retail stocks competing with Amazon all a dangerous bet? Not necessarily.

A look at Amazon competitors Best Buy and Wal-Mart (NYSE: WMT) reveals some promising numbers.

Leveling the playing field
Believe it or not, Best Buy's stock has trumped Amazon's over the past 12 months, up 50% compared to Amazon's 41% gain. Year to date, Best Buy is up 140%, compared to Amazon's 23% gain. With Best Buy's revenue down, and Amazon's substantially higher, how is this possible? Expectations.

The stock market is all about expectations. If the market expects a business to perform exceptionally well, investors buy up a stock until the buoyant expectations are priced into the stock. Conversely, when investors expect a business to perform poorly, the stock sells off until poor expectations are priced into the stock.

In other words, valuation matters. That's the first reason investors shouldn't give up on brick-and-mortar retail stocks. Greatness is already priced into Amazon's stock. The stock trades at 2.2 times sales. Comparatively, Wal-Mart trades at .6 times sales.

Amazon's price-to-earnings and price-to-free cash flow ratios aren't even meaningful. Quarter after quarter, the company barely slips by with a profit -- sometimes reporting losses. Even worse, in the last thee years, the company's cumulative free cash flow is actually negative.

While investors wait for Amazon to bring in the dough, Best Buy and Wal-Mart both trade at realistic valuations, with free cash flow yields of about 4.5%. Amazon's free cash flow yield? Just 0.13%. Amazon investors obviously expect a very bright future for the company.

Sure, Amazon may grow into its valuation. But Best Buy and Wal-Mart may also outperform their low expectations. Valuation, therefore, levels the playing field.

Where's the money?
Yes, Best Buy's revenue is down this year. But the company is still generating a large amount of cash. Over the trailing 12 months, Best Buy raked in $564 million in free cash flow. Amazon? Just $177 million. That's a paltry number in light of the company's $140.5-billion market cap. (Best Buy's market cap stands at just 9.7 billion.)

How's Wal-Mart faring? Trailing 12-month revenue is at an all-time high. Even better, the company generated a meaningful $11.56 billion in free cash flow in the last 12 months.

It's not the end
Does this mean that Wal-Mart and Best Buy are better investments than Amazon? Not necessarily -- but don't count brick and mortar as dead yet. As an article in The Economist eloquently explained, there are still indications that brick and mortar has a chance against e-commerce:

Bricks-and-mortar retail may be losing ground to online shopping, but it remains more profitable. The physical world is also increasingly capable of taking the fight to its online competitors. Last year online sales of shop-based American retailers grew by 29%; those of online-only merchants grew by just 21%.

Keep your eyes peeled for brick-and-mortar investment opportunities. Sometimes, the greatest investments are found in unloved sectors.

Don't forget about dividends
One of the fortunate benefits of investing in stocks with low expectations is often their meaningful dividend yields. This holds true for both Wal-Mart and Best Buy. If you're on the lookout for high-yielding stocks, The Motley Fool has compiled a special free report outlining our nine top dependable dividend-paying stocks. It's called "Secure Your Future With 9 Rock-Solid Dividend Stocks." You can access your copy today at no cost! Just click here.

Fool contributor Daniel Sparks has no position in any stocks mentioned. The Motley Fool recommends Amazon.com. The Motley Fool owns shares of Amazon.com. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.