It looks like you can now order your free Covid At-home test kits via the USPS.
This is the confirmation text...
"COVID-19 tests will start shipping in late January.
"USPS will only send one set of 4 free at-home COVID-19 tests to valid residential addresses. "Thank You! "Your order #: (28 alpha-numeric code) has been placed. "If you provided your email address, we'll send you an order confirmation email and delivery updates."
