I sent out blood-ox monitors to all my family members after a discussion on COVID hypoxia with a MD friend. It’s never my favorite source, but in the US there

I sent out blood-ox monitors to all my family members after a discussion on COVID hypoxia with a MD friend. It’s never my favorite source, but in the US there are a number of Chinese companies with US shipping on EBay. I purchased 7 devices from “ConTec” at ~$26/each. All arrived and at least my unit read the same as a retail unit from Walgreens. Not trying to shill, there are a number of other sources with thousands of positive reviews.