If you visit Japan pick up these multipack COVID and influenza antigen tests. 4-pack from Amazon JP 1200 yen is $7.64. The equivalent from Amazon US is $40.
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In my experience approved tests in the US have high failure rates. I found it cheaper to buy many low quality tests and just try another if the control line fails. I previously bought these tests in Japan for less than $1 each.
Sensitivity of antigen tests is low in the best circumstances. You typically need to retest multiple times to rule something out. For this reason I rather buy tests as cheaply as possible.
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Approved ones have「体外診断用医薬品」or「第１類医薬品」but I'm not sure if they are easily purchased online.
https://www.mhlw.go.jp/stf/newpage_27779.html