Always low prices, always. How? Don't pay the employees. From the Labor Blog:
One measure of what an economic criminal Wal-Mart has become is how routine it is when 200,000 Missouri workers are certified for a class action against the company for illegally failing to pay them for rest breaks and forcing those employees to work off-the-clock.
While there is a long trial ahead, just getting class action status required extensive testimony by the employees, where the judge stated that the plaintiffs (from BNA Daily Labor Report, no link): "have demonstrated by compelling testimony that a Sam's Club payroll manager was trained and instructed to systematically and routinely deduct rest breaks and meal breaks from employees' daily time records, with or without verification by the employee or supervisor; [and] that unauthorized overtime pay was removed or edited from time records."
Stealing a dollar a day from 200,000 employees sure helps cut the cost of Sam's Choice soda.