Anyone know where to find a cheap used bipap?

Like really cheap.

Define "Really Cheap"

STL Mark had one for, I think, $600.

Cheaper than that? Maybe an older machine ... you'll have to haunt CraigsList and the like.

Also, check out http://www.secondwindcpap.com/. I see some around $450 there...

check your Private message box please.

Like a brick.

I have a BiPap Auto w/biflex I'm not using ... like this one.

https://www.cpap.com/cpap-machine/bipap ... iflex.html

I bought it used from a fellow CPAPtalk member a few years ago (june 2010). As I recall, it has about 650 hours of use. I only used it twice myself just to experiment with exhalation relief and to see for myself if a BiPAP would have any difference in my quality of sleep. It did not for me. In fact I now have my pressure titrated so precisely that I use CPAP mode on my APAP machines (I have two of those).

Anyway, the only caution/issue you need to be aware of is that -- to me, it does have a very faint vanilla scent from the previous user who must have used aromatherapy oils with it or more likely in the same bedroom. It is very faint and I do have a very sensitive sense of smell so it should be nothing to worry about unless you too have very sensitive smell and you hate vanilla scent.

I paid $400 for it a few years ago. I'll sell it for $300 with paid shipping to lower 48 states (out of lower 48 buyer pays shipping).