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From Fellrnr.com, Running tips
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* The starter kit is $190 and contains 3 AltoMixers giving 5,000-15,000 ft of elevation, 2 silos (CO2 scrubbers) proving 4 hours of usage, and the masks.
* Replacement silos (CO2 scrubbers) are $30
==Oximeters==
A pulse oximeters measures the level of oxygen saturation of the blood by shining a light through the skin, usually at the finger. Standalone pulse oximeters are available from Amazon for less than $100.
==References==
<references>
<ref name="semi">http://en.wikipedia.org/wiki/Semi-permeable_membrane</ref>
<ref name="hypo">http://en.wikipedia.org/wiki/Hypoxicator</ref>
</references>