https://special.usps.com/testkits
As of September 25, 2023, residential households in the U.S. can order one set of #4 free at-home tests from USPS.com again. Here’s what you need to know about your order:
Limit of one order per residential address
One order includes #4 individual rapid antigen COVID-19 tests (COVIDTests.gov has more details about at-home tests, including extended shelf life and updated expiration dates)