I've been on CPAP for a few years. I just bought a new machine this summer online. I got the model I wanted with a heated humidifier. Its all in one unit, easy to travel with, I got it for about 450.00. I just used BCBS to get the sleep study redone then bypassed it to buy the machine. I have a 750 ded. and I could not choose the machine I wanted, all they offered were the big bulky machines. I got free head gear and a few different kinds of masks because the girl at the clinic felt sorry for me and gave me a few samples they had, so I lucked out there.