Wal-Mart (Stock Quote: WMT ) is known for having record low prices, but they are about to set another benchmark. The company is now the target of the biggest employment discrimination case America has ever seen. Six women filed a gender discrimination lawsuit against Wal-Mart back in 2001, but the company fought vigorously to stop the class action suit from going through. Now, nearly a decade later, a federal appeals court in San Francisco has ruled the Wal-Mart case can finally go to trial. To make matters worse for Wal-Mart, the court ruled that this class action lawsuit can include the claims of any woman who has worked at a Wal-Mart since 2001. Some have estimated this could amount to 1.5 million former employees, though Wal-Mart claims the number is closer to 500,000. Either way, Wal-Mart is at risk of losing billions and billions of dollars.