Availability The Luna G3 Auto CPAP Machine is available from select authorized CPAP machine retailers. Before buying the device, you’ll need a prescription from your doctor. Shipping The available shipping locations, delivery timeframe, and shipping costs vary by seller. Many retailers offer free shipping within the contiguous U.S. Some assembly is required after the device arrives. The user manual has step-by-step assembly instructions. Sleep Trial Each seller has a specific return policy. Some allow the device to be returned within a certain period, while others don’t allow any returns. In general, used CPAP machines are not eligible for return since they are considered medical devices. Warranty The Luna G3 Auto CPAP Machine has a two-year manufacturer’s warranty that covers the repair or replacement of a defective device. While most sellers follow the manufacturer’s warranty, not all do, so be sure to check the fine print before purchasing.