It's always important to purchase from an accredited medical supply company, such as American Medical Sales and Rentals. Medical equipment shopping is very serious because you need to be able to get the best products on the market, that are in good working order.
You need to be able to get the proper dosage of oxygen therapy that was prescribed by your doctor, or get a CPAP or BiPAP machine that will treat your sleep apnea properly. CPAP masks are very important because you need to choose the one that works best for you. At American Medical here in Denver, CO., we'll work with you to try on different sizes and styles until you can find the one that works for you.