While you can't buy the machine unit legally without a script, many do not require one.
Some retailers, like CPAP.com and CPAPnation , sell mask assembly kits. These include the frame and cushion but ship without the headgear. By purchasing the headgear separately, you can often "build" your mask without a prescription. The "Grey Market" Risk buy cpap without prescription
Your doctor determines if you need a standard CPAP, an Auto-titrating (APAP), or a BiPAP for more complex breathing issues. What You Can Buy Without a Prescription While you can't buy the machine unit legally