The price of the latest model of the Amazon Echo Dot drops to $22 at Amazon. Shipping is free over $25 or with a Prime account. Otherwise, shipping adds $5.99. This is for all three colors: Sandstone, Heather Gray, and Charcoal. This has also dropped at other retailers, but it's the best price we've seen in a while. Plus Amazon is offering trade-in cash back for older device. For example, you can get $5 for trading in a second-generation Echo Dot. This is the latest version of the Echo Dot, which houses Amazon's Alexa digital assistant. Sales tax is charged in most states.