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There are various hypoxia (altitude) systems on the market that vary widely in price. Here are some notes I've made while looking at the market place.
==Mechanical Hypoxic Generators==
Mechanical generators<ref name="hypo"/> either use Pressure Swing Absorption<ref name="psa"/> or a semi-permeable membrane<ref name="semi"/>. These generators tend to be expensive to purchase, but require no ongoing maintenance. Note: Apparently CAT, Hypoxico, and Higher Peak use generators from the same supplier, but at significantly different prices. The units appear physically identical.
===Hypoxico===
Hypoxico systems is an established manufacturer. The prices shown below were what I was quoted in 2009. There are no published prices on http://www.hypoxico.com/ but some prices are shown at http://www.bikemania.biz/Altitude_Trainers_s/185.htm