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Your local Analox affiliated dive shop can order them directly from Analox USA or UK.
Analox - Distributors
I know this an old thread but after much searching I just picked up a new sensor from Vanagraph Limited in the UK. Their R-33DE Oxygen Sensor was £60 shipped - approx US$76 - much less than any supplier here. Super fast too - 5 day turnaround from the UK.