You can also get a home test for about $500 after insurance, get a Rx from your doc, and then buy a $200 CPAP unit with low hours off ebay, Craigslist, FB Marketplace, etc. Or skip the test / Rx and titer the machine yourself using Sleepyhead / OSCAR with the help of very capable folks on cpaptalk.com. It sounds hard until you look into it, and then it's not really that difficult.