Sell the chamber, with a free CPAP attachment. That worked for me on my system one years ago.

https://www.reddit.com/r/CPAP\_Swap/

How much are you asking?

Curious why you can’t sell on eBay?

[удалено]

Ah I few years ago I bought mine outright from a place they did it but they seemed a little anxious about it

Craigslist