Best and cheapest obd 2 scanner on Amazon?

2015 Mazda3
I've seen on amazon various prices from under $20 to over $20. Any suggestions?

Is the #1 best seller a good indicator (Ancel AD310)?
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I bought a bluetooth one from ebay for like $3. Then I have an app on my phone to just connect to it. It "just works". Connects fine, I can see messages, reset warnings etc.

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