Steven,
Not too long ago, Turnermedical.com had a sale special for pilots at
$150. Their current price is $199 with free shipping. If you don't
need one right away, you can wait for a sale. I had thought of
ordering one but Rick did not think that it was necessary, He thought
that if we needed to fly at high altitude (over 10,000'), we would just
use oxygen

http://www.turnermedical.com/Finger_Oximeters.htm

or you can pay $189 also with free delivery here

http://www.medical-monitors.com/spo5500.html


Hai Longworth