From Sony, but check Reverb... Sony has been out of stock for over a year now. The diaphragms are hard to produce/source, so second hand just keeps going up without Sony putting new units out.

C800G is no longer for sale by Sony.

Famously used by Mariah Carey.

That's not really correct. They don't have any stock by they have promised new stock to retailers.

In fact, it's coming back with a new SKU (again): https://www.frontendaudio.com/blog/sony-announces-the-c800gp...