Every home in the U.S. is eligible to order 4 free at-home COVID-19 tests from the federal government. The tests are completely free. Orders will usually ship in 7-12 days.
Bucks County is also distributing free Covid test kits at sites around the county:
https://www.buckscounty.gov/1523/COVID-19-Rapid-Home-Test-Kit-Information
Go to the Bucks County Health Department Covid Portal for more information.