Avalon Direct via Amazon offers the iLife A4s Smart Robot Vacuum Cleaner in Gray for $179.99. Coupon code "6GNQOI9X" drops it to $143.99. With free shipping, that's $6 under our mention from a month ago and the lowest price we've seen. (It's the best deal today by $16.) It works on a variety of floor types and features a HEPA filter, 3-step cleaning system, programmable scheduling, smart sensors, 120- to 140-minute run-time per charge, and automatic docking and recharging.