I have tested covid positive. in bed with chest pains and high fever. where and how can i get a oximeter please advice.

On the web: If you are in the states, some CVS/Walgreens are referred to as medical centers and carry more health equipment than typical stores, but the web (like Amazon) will offer multiple varieties to fit your needs. Also check medical supply companies in your area. Good luck

Pulse oximeter: I don't know what country you live in. In the US- we can purchase them from a drug store. In some other countries they are purchased from Chemist store or pharmacy. Easiest way if you are sick is to order -on-line.