Originally Posted by Gardyloo
The doctor issues a prescription. The customer (in cahoots with the insurance company) is the arbiter of what machine to buy. AFAIK nobody will sell a machine without a valid Rx being presented. The hospitals and sleep clinics would prefer that you buy the machine they stock in their sales rooms. But you don't have to.
Sleep clinics are not allowed to stock machines, nor sell machines. It is against the law for sleep clinics to have any sort of financial incentive in suggesting CPAP.