Try as best you can to have the Dr rule out other physical/medical problems as much as possible and then...well, as they say...Craiglist is everywhere.
I am using my hubby's old "brick" CPAP until my own APAP comes in.
Diagnosed: 44 AHI when supine, O2 down to 82%
Treated since 20 Sept 2014:: 0.7 AHI, Settings 7-15, EPR on Full Time at Level 3
Better living through CPAP/APAP machines!