Looks like Oakland Airport is the first airport in the US to begin selling COVID test kits in vending machines.
These are contactless kiosks located at both airport terminals.
The kits are called "At-Home Saliva RT-PCT" tests. You take your own test and then return the saliva sample via FedEx. You will get your results in 24 hours on a mobile phone app.
Test kits range from $130 to $150. Kits are created by a digital health company Wellness 4 Humanity. Get more info here via KTVU.