You learn not to always take the first result Google gives you. The first result produced a price of $60 for the little gel part. Heck, I could replace the entire mask assembly for only about $100! The next result showed the part for $6 plus $4.50 shipping. I went ahead and ordered it.
I can still use the mask, but it's less comfortable and leaves a mark on my forehead.
Six hours sleep helps catch up on the deficit, but now I need to go pay the interest. Zzzzzz.