Amazon Spring Sale robot vacuum deals: The best sales from Shark, iRobot, Dyson and others

One notable trend at CES earlier this year was the quirky robot vacuum. It seemed every third booth had a new model that could climb stairs, pick up socks, serve drinks and, oh yeah, suck up dirt from your floor. Now that Amazon's Big Spring Sale is here, we're seeing lots of discounts -- not on those wacky prototypes, but on robo vacs that easy and automatically keep your floors clean. Engadget has two guides to these handy home gadgets, based on years of testing and reviewing products from brands like iRobot, Shark, Dyson, Eufy and more. Here are the best deals on robot vacuums and cordless stick vacs we could find for the Big Spring Sale. This is a version of one of our top picks in our best robot vacuums guide.