The iRobot Roomba 620 Vacuuming Robot drops from $419.99 to $339.99 and then to $263.99 when you stack the codes 4RFRIENDS and MOMSDAY10 at Kohls.com. Plus, the shipping is free and you'll receive $50 Kohl's cash that can be redeemed between May 9th - 22nd. This is the best price we could find for this Roomba by $32. The Roomba 620 works on both carpet and hard surfaces and comes with a self-charging home base. A 1-year manufacturer warranty is included and sales tax is charged in most states.