B&H Photo Video offers a pair of Sonos One Voice Controlled Smart Speakers in Black or White for $349 with free shipping. (Sonos, MegaRetailStore via Amazon and World Wide Stereo have it for the same.) That's $175 per speaker and the best price we could find by $49, although we saw one speaker for $174 on Black Friday. This Amazon Alexa enabled speaker can be stereo paired with another Sonos One.

Note: This pair of speakers is expected to be the same price via a number of vendors, competing with the price of Apple's new HomePod.