Boy_Anupong / Getty Images Ally now lets you add cash to your online bank account by taking your paper money to the nearest Walmart. Key Takeaways Ally’s new cash-deposit option fills a long-standing gap in online-only banking for anyone who accumulates physical money. Adding cash to your Ally account now takes just a barcode and a quick stop at Walmart, giving you a simple, no-fee way to deposit funds. Pairing these features with a top high-yield savings account can help you earn more. How an On ...