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The Harman Kardon Invoke Smart Speaker drops from $199.99 to $99.95 with free shipping at the Microsoft Store. This is the best price we found for one by $29. This Bluetooth speaker uses Microsoft's assistant called Cortana. It should offer the best sound of any smart speaker, since it's made by the well-respected audio brand Harman Kardon and has three woofers, three tweeters, and two passive radiators. Sales tax is charged in most states.