Save on machines from iRobot, Shark, Dyson and others

It’s frankly amazing how good vacuum cleaners are these days. Once the laughingstock of the gadget world with their dusty bags and tiny wheels, today’s vacuums are sleek dirt-destroying machines, capable of rendering a house habitable no matter how many cats live in it. Some of them are even robots that will do the cleaning for you. For October Prime Day, Amazon has steeply cut the prices of some of the best vacuums (and some pretty good ones alongside). Now is a fantastic time to upgrade your cleaner,…