The Vault ones at MSP airport were saliva tests. Not sure if that’s changed.
The free testing at MSP and sites elsewhere in short distance to MSP may not be operating on dates like Christmas Eve, Christmas Day, NYE, and New Year’s Day. Just something to keep in mind.
Being a more commercial operator where individual payment is generally required, maybe Wandertest at MSP has a different availability schedule than the free testing at the airport.