Some of the best robot vacuums we've tested are on sale for Prime Day, including savings of up to 50% on top-rated models from iRobot, Shark and Eufy.

The longest Prime Day ever is officially underway (through July 11) and as per usual, Amazon has discounted its own devices to some extreme lows. While we haven't been super impressed by the Echo deals overall, things like Kindles, Fire tablets, and Fire TVs are seeing their best prices ever by a long shot.

I search for deals for a living and these are the best Amazon Prime Day deals I can find, as you can still save over 90% before the event's end.