Just as we examine companies each week that may be rising past their fair value, we can also find companies potentially trading at bargain prices. While many investors would rather have nothing to do with companies tipping the scales at 52-week lows, I think it makes a lot of sense to determine whether the market has overreacted to the downside, just as we often do when the market reacts to the upside.

Here's a look at three fallen angels trading near their 52-week lows that could be worth buying.

Time for an Obamacare bump
The Patient Protection and Affordable Care Act has plenty of investors skittish about investing in the health care sector. There are countless questions as to how insurance costs will be affected and exactly what that might do to small business growth. One thing for certain, at least as I see it, is that Cardinal Health (NYSE: CAH) stands to benefit in a big way.

One major reason Cardinal could be a great buy now is the health care insurance industry's emphasis on cutting costs. Insurers have been encouraging the development of Accountable Care Organizations in order to pool physicians and patients together to keep costs down. One way these ACOs will deal with the rising costs of health care is by increasing the amount of generic drugs used. Cardinal, which distributes branded and generic drugs, could be a big beneficiary. Much like the multiple discussions I've had surrounding Teva Pharmaceutical (Nasdaq: TEVA), a large generic drug manufacturer, the margins and demand associated with generics are much higher. When Obamacare is enacted in 2014, I'd be surprised not to see an influx in generic demand within the first few months.

Cardinal also boasts a very modest payout ratio of just 29%. Even with the company's lackluster EPS forecast of $3.35-$3.50, it could easily boost its dividend by 30%-50% and still have very sustainable cash flow with which to seek future acquisitions. For now, I'll happily take a 2.4% yield, though I expect it to go much higher.

A wireless double-whammy
USA Mobility (Nasdaq: USMO) shareholders would probably like to pull an ostrich and hide their heads in a hole until the worst is over. The company, which provides messaging, voice, and data services to large enterprises, the health care sector, and the government, has dealt with reduced spending from the government and a cutback from big telecom providers in terms of mainline infrastructure spending. The result has been a steady decline in subscribers and falling average revenue per user.

Today, I'm going to go against the grain (as I typically avoid companies with falling ARPU) and suggest that USA Mobility may be too good of a deal to pass up for income investors and for its peers. First, there's that delectable dividend of 4.6% that's right on par with industry giants AT&T and Verizon. Also, USA Mobility is debt-free and sporting $41 million in cash. Having recently reinstated its share buyback program, USA Mobility is also angling to make strategic purchases for its strong Amcom software business, whose backlog rose nearly $5 million from last year.

At a market value around $250 million and with consistently positive cash flow, USA Mobility's peers could easily swoop in to nab the companies growing software business and perhaps better utilize its health care industry wireless solutions tie-ins.

The market-maker you should really consider
Following the debacle earlier this month whereby a software glitch at Knight Capital Group (NYSE: KCG) generated a loss of $270 million after tax -- and possible more when all is said and done -- in just 45 minutes, suggesting a market-maker and brokerage service provider as a buy probably isn't going to sit well with many of you. However, I feel you'd be doing yourself a disservice by not giving Interactive Brokers (Nasdaq: IBKR) a serious look.

Truthfully, July wasn't a great month. Most of Interactive's metrics, including overall trade volume and options contracts, were down, but much of that is to be expected in the summer, and with volatility being at its lowest levels in five years. Interactive did grow its total customer accounts by 13% from the previous month and 1% year over year. Personally, I see this as the most defining buy factor as an increase in volatility will bring trading volume back to Interactive's accounts. It also shows how well-respected IB is among its brokerage peers.

In order to fully bounce off its lows, Interactive is going to need a better performance from its market-making segment than it received last quarter, but Knight's miscues should help its cause and boost its routing volumes, at least for the time being. Being well-capitalized and trading at just 10.5 times forward earnings, it's a long-term bet on an increase in trading volumes and order routing from both the consumer and institutional side of the business.

Foolish roundup
This week's trend is all about looking for the light beyond the clouds. All three companies this week are suffering growing pains, but each offers notable bonuses, including dividends and historical track records, that would indicate a bottom is near.

I'm so confident that these three names will bounce off their lows that I'm going to make a CAPScall of outperform on each one.

In the meantime, consider adding these potential winners to your free and personalized watchlist, and get your own personal copy of our special report "The Motley Fool's Top Stock for 2012." Find out which company our chief investment officer has dubbed the "Costco of Latin America." Best of all, this report is completely free, so don't miss out!