It's no secret that Amazon Prime Day is one of the best times of the year to pick up an Echo speaker. That was true for the main sales event in July, and it's true again for October. Most of Amazon's smart speakers and smart displays are down to record-low prices, or close to them, so Prime members can pick them up for some of the best prices we've seen all year. If you've wanted to add to your smart home setup, or build one from scratch, now's a great time to get an Alexa-enabled device. Here are all of the best Prime Day deals on Echo Dots, Echo Show displays and more.

Aside from Black Friday, Amazon Prime Day is the best time of year to pick up an Echo device since most of them are deeply discounted. Amazon didn't disappoint this year -- all of its Echo Show smart displays are on sale for Prime Day, key among them being the Echo Show 8 for $75. Also on sale are the Echo Show 5 for only $35, the swiveling Echo Show 10 for $180 and the Echo Show 15 for $180 as well. It's the second-generation Show 8 that you can get for $75, and we gave it a score of 87 when it came out last year. We like its 8-inch, 1,280 x 800-resolution touchscreen, minimalist design and solid sound quality.

The new $130 Echo Show 8 takes the top rank as the greatest Alexa smart display, with the Echo Show 10 being more novelty than necessity (that revolving screen doesn't support the $250 price tag). The second iteration of Amazon's mid-sized smart speaker with a display, which was released this month, combines some of the greatest features from the Show 10 (13-megapixel camera, digital zoom, and security camera functions) and compresses them into a more manageable size. The Echo Show 8 has a small enough footprint to sit on a bedside table or a kitchen counter. The Show 8 (available in Charcoal and Glacier White) offers the most bang (and screen size) for your buck, with a virtually identical design to its predecessor (same display, same speakers), but with a bit more behind the hood, including a new octo-core processing and a beefed-up camera. You can still watch shows, listen to music, control your smart home, send out announcements to your family, and check in on friends and family, but you can now zoom with a 13-megapixel camera.

Amazon's Echo Show line has been around for four years, but until now the screen sizes have ranged from five to 10 inches, making it ideal as a multipurpose bedside alarm or a companion screen in the kitchen. The 15-inch Echo Show 15, available now, is by far the largest size Amazon has attempted, and it's also notably the first Echo Show you can mount on your wall. Because of that, the company is betting some people will use it not just as a digital photo frame, but also as a family bulletin board. If that's specifically what you want out of a smart display, the Echo Show 15 could be a niche but very fitting match. Somehow, though, we suspect that's not most people.

The brushless motor that almost silently spins its 10.1-inch HD display around a 350-degree arc is the feature that will grab your attention when you take it out of the box, but you'll quickly discover many more things to get jazzed over when you set about exploiting its capabilities to the fullest. This is a fantastic feature whether you're following a recipe, engaging in a video call, or watching a movie on Netflix. And Amazon gives you full control over how motion occurs: You can disable it entirely, enable it only for some activities--such as when making video calls, watching a video, or following a recipe--or you can activate/deactivate it on demand by saying things like "Alexa, follow me," "Alexa, turn right," or "Alexa, turn off motion." If you place the Echo Show next to a wall or in a corner, you can adjust how far it will rotate so that it doesn't bump into anything as it spins. The display apparently has a clutch or a similar mechanism that automatically disengages the motor while at rest, allowing you to manually turn the display left or right even if motion is enabled.

Ever since the original Echo Show, smart displays have proven to be pretty useful around the house. They're great for quickly looking up information, recipe instructions, video calls and more. As you're actively crisscrossing the kitchen while cooking a meal, you have to keep backtracking to look at the screen for the next step. Or if you're on a video call with mom and you walk away to make a cup of coffee, you're forced to become a disembodied voice as she converses with a wall. The all-new Echo Show 10, however, helps solve that problem.

Amazon has new Echo speakers to sell you. And if you're wondering whether or not to ditch the old ones for these, the answer comes down to two key questions for Alexa, the personal assistant. Do I prefer the looks of a round speaker over a cylinder? Do I crave better sound? This year Amazon is all about being spherical, in the shape of its "The Spheres" corporate headquarters in Seattle.

Amazon hosted an invite-only product launch event Thursday, and we got a look at several new products. A new, moving smart display was announced, called the Amazon Echo Show 10. It costs $250 (£240), and will be available "soon." The Echo Show 10 is Amazon's first motorized smart display. It uses the AZ1 Neural Edge processor's sound localization and computer vision models to triangulate your location in the room and turn the screen to face you.