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Costco announced an expansion of ultra-fast delivery options for its members through partnerships with DoorDash and Uber, aiming to offer quicker fulfillment of online orders. The move reflects continued efforts by big-box retailers to compete with e-commerce rivals on delivery speed. The expansion adds Costco to a growing list of traditional retailers leaning on third-party delivery platforms to meet consumer demand for faster shipping without building out their own last-mile logistics networks.