Reputable sellers must ask for a prescription. If they don't, they are likely operating illegally and bypassing safety standards.
Steer clear of Craigslist, Facebook Marketplace, and eBay. These sites often prohibit CPAP sales, and machines found there may harbor bacteria, mold, viruses , or even pests like bedbugs. buy used cpap
Never use a second-hand mask, tubing, or water chamber. Always buy these brand new to ensure sterility. Safe Sources for Refurbished CPAP Machines Reputable sellers must ask for a prescription