Time to upgrade your audio environment? Add a smart speaker to another room? Score a new Bluetooth speaker to take on the road? You’ve picked the right time. Amazon is offering fantastic deals during its Amazon Prime Early Access Sale—aka Prime Day 2, aka October Prime Day. We had spotted some great deals on Amazon’s older Echo devices (hello Alexa!), but when we last checked, several models were listed as “currently unavailable,” so we’ve removed them from this listing. We’ve divided the speakers on this list into two categories: Smart speakers and regular Bluetooth speakers. The lists are th…