Amazon has been pushing the Echo Dot quite a bit since it was launched a few months ago. It's the only Alexa-powered product that is bundled with other products to get your smart home started. Amazon has bundled it with things like the TP-Link Smart Plug, Bose SoundTouch 10 and more. The reason why Amazon bundled these together is because Alexa can control these things. Making them great products to pair together. The Amazon Echo Dot is normally $49.99 by itself, and they have been running a special on the 6-pack (essentially giving you one for free), but now they are running a special on a pack of three Echo Dots.
Now the way you get this discount on a three-pack of Echo Dots is by adding three Echo Dots to your cart. Then at checkout, you'll need to use the code DOT3PACK and you'll see $20 taken off of the total. That should bring the total down to about $129.97. Of course there is free shipping, and it is included with Amazon Prime so you can get it shipped before Thanksgiving, if you buy it today. The Amazon Echo Dot is a great little piece of kit, and can be connected to any other speaker for even better sound.