They're slowly moving to "at home" sleep studies, so hopefully the cost will come down. Essentially they just loan you a bunch of monitors on a chest belt, teach you how to put it on, and you return it the next day for your consultation.

Here's a video showing how to install the monitor:

https://www.youtube.com/watch?v=FHvydhYu85o

It is still a "developing area" but I think it will be the norm eventually. It *should reduce the cost (but YMMV, as US healthcare costs don't conform to normal logic).