If you are looking for an BiPAP Machines (both,used/new), you should check this website (https://bimedis.com/ad/sl/4dd710d0aedf0d885d3814cc93e6d08c?mid=14446)
I bought some (BMC MEDICAL CO RESmart, PHILIPS DreamStation, PHILIPS RESPIRONICS DreamStation DSX600T11 and PHILIPS RESPIRONICS DreamStation DSX700T11) equipment there - they have good servicing, normal prices and everything is simple in using. And what I think is the most important thing - providing warranty