Avalon Direct via Amazon offers the iLife A4s Smart Robot Vacuum Cleaner in Gray for $199.99. Coupon code "PRIMEA4S" drops that to $149.99. With free shipping, that's $10 under our mention from three weeks ago and the lowest price we've seen. (It's also the best deal today by $10.) It works on all floor types and features a HEPA filter, 3-step cleaning system, 120- to 140-minute runtime, and automatic docking and recharging.