I note that not all of these tests are accepted by the CDC for re-entry to the US.
For example, the free tests I got via the government (iHealth COVID-19 Antigen Rapid Test) says it is not accepted for travel. They have an app that you can store your results in but it has a tiny disclaimer at the bottom that says "This is not a PCR test and not valid for travel."
Looking for the BinaxNow test referenced above, I found the "BINAXNOW™ COVID-19 ANTIGEN SELF‑TEST" but it says specifically "This test does NOT meet the CDC testing requirements to enter the U.S. when returning from a trip abroad. For proof of a negative COVID-19 test, you have to get a different test: BinaxNOW COVID-19 Ag Card Home Test".
I'm unclear about the different tests so it might be obvious these don't apply but I'm just calling out to readers to specifically check.
I'm thinking of bringing my own test just to hedge against any screwup getting the test before flying back.