I wasn't sure if I should write this here but I hope it is ok.

Doug,

I've searched for an oxygen concentrator in Ukraine and this is how things look like:

Almost all shops in Ukraine sell some sort of rebranded "Healicom 7F"(something chinese, idk) line of oxygen concentrators. Usually these are 7F-3 (3lpm) and 7F-5 (5lpm) models.
The 3lpm models are from 13000uah and the 5lpm models are from 16000uah.
I've called a couple of shops that had lower prices on their websites but it turned out that they had not updated their websites yet.
Used Healicom 7F 5lpm are sold for about 7000-9000uah.
There are lots of Healicoms(rebranded as Biomed, Armed etc) here, so I guess it is possible to find them cheaper.


Other used concentrators:
Devilbis 5lpm - 14900uah (The seller claims that it has been in use for 5000-7000 hours out of 30000)
Airsep Visionaire 5lpm - $350 (I havn't called this guy, not sure if this is the real price. The ad sais the concentrator has been used for 40 hours only)
Invacare Perfecto2 5lpm - 600eur (less than 1000h in use)
AirSep New Life Elite - 13500uah


This is what the market looks like. If you find these prices acceptable, I will dig deeper into this.

PS note that $1 is about 25uah now.