I didn't read all the posts so if this has been mentioned please forgive me.
The only differeence between an oxycon and an oxy generator is size. They both operate on the pressure absorbtion principle. Generally if it is industrial size it is called a generator and if for basically medical use it is called a concentrator.
To reduce your tanked oxy cost find the lowest priced supplier near you and set up an account. My supplier charged (several years back) $38 plus fees for a 250 cf walkin exchange. After setting up my account it dropped to $18 plus fees.
PJH
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