Walmart has announced a new service allowing customers to make store-to-store money transfers within the United States at cut-rate fees. The offering is aimed largely at lower-income shoppers who often rely on check-cashing stores for simple transactions. Walmart has become a big player in alternative financial products including prepaid debit cards and check cashing. Walmart's new service will offer transfers of up to $50 will cost $4.50 and transfers of up to $900 costing $9.50. In comparison, sending $900 via Western Union could cost as much as $76. But Western Union and MoneyGram pointed out that their hundreds of thousands of global affiliated locations overshadow Walmart's roughly 4,000 U.S. locations.