Amazon has a remanufactured iRobot Roomba 4230 Robotic Vacuum for $164.99, matching the lowest price to-date, if you enter their $25 off $125 coupon code valid in kitchen & housewares. The Roomba 4230 has a scheduling remote, artificial intelligence to adjust to floor types and stairs and a non-marring bumper. The new Roomba 4230 is $310 (or $285 after the same $25 off code). Amazon also has a refurbished Roomba 4100 for $89.99. Shipping is free and there is no sales tax (except KS, ND, WA).