The HomePod mini is perhaps the Siri smart speaker that Apple should have done sooner, but it's certainly the one you should buy now, even with some limitations.
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Apple 4Y5H2LL/A HomePod mini - White at MacSales.com
Apple HomePod review: a Siri speaker with a bass problem, Apple
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Apple HomePod Mini review: These little Siri smart speakers are a big hit - CNET
Apple Introduces $99 HomePod mini - TidBITS