I am an electrician in a booming oil industry... I spend all my extra cash on trying to get rid of this candida, and creating a protocol that actually works.
As for cheap oxygen products... try talking to ozoneman, in the oxygen forums. He probably will be able to help you out. I know your pain though, everyone here with systemic candida spends all their extra cash trying to get rid of this affliction.
His website is http://www.ozonatedoilonline.com,
however he is based in canada so it might be cheaper to buy in the states. Promolife.com is another good site.
I am really hoping that Colloidal Silver is the magic bullet for candida though. It sounds like once a persons body is prepped it works wonders for killing pathogens. Just for 150 bucks, some pro-biotics, and a healthy diet.