I got tired of waking up with headaches and feeling shi77y so I bought a used CPAP from FB Marketplace for $15 and then got all new filters, hoses, and nasal pillows (also from FBMP). In total I spent $105 for stuff that would have cost closer to $1000. No sleep study. No doctors referrals bs. The first night on the CPAP my Snore Score was this: [Notice that I got a full night sleep also. I feel much better and I look forward to sleeping now because it just feels soooo good now.]
*Your mileage may vary....