Pretty specific but if you have a Resmed CPAP and wear a full face mask this is a really good deal.
Full set of headgear is usually $170 and the foam cushions are $20 a piece so this is basically either $100 worth of cushions as a bonus or 6 masks for $120 and a full mask setup for an extra $50.
Really excellent price if you use a full-face mask. Good find.
Oh hey, looks like that site has all the Resmed masks on sale atm