Those "at home" Covid tests have gone the way of empty shelves and toilet paper. To make it worse, really, really, worse is the Administrations to suck up some 500 million wiping out any rational distribution. Now you have to seek permission from the Feds to be tested and wait until they send you a test. This is classic Communism in Russia during the 30s.
It is counter to any rational market approach. The efficient distribution channels are existent, namely the pharmacies and even say any on line purveyor, except perhaps in my opinion and my experience Amazon, where one has no idea who is selling what.
So mark my words, once a scarcity exists, when the Government decides to take control, the scarcity increases until there is none. Getting your tests from the Feds is in my opinion one of the dumbest ideas ever created by the mind of a human. But alas it is the Wunderkind in the current Administration.