As new, used exactly once (wife's not into sleeping at altitude, or sleeping next to me while I do).

Check it out here: http://www.higherpeak.com/buynew.html

Similar to the other more expensive units in every way.

I'll include the O2 analyzer (you certainly want this) in the sale price. Comes with two masks for use without a tent.

$1,700 + shipping (probably around $100 within the continental US). I will only ship within the US.