Dealzmodo: Buy 2 Get 1 Free for Three-Pronged iRobot House Cleaning TeamiRobot is offering up a few new combo discounts on several of their dutiful house-cleaning 'bots. If you're buying a Roomba 580 vacuum and Scooba 380 floor-mopper tandem for around $1,000 total, they'll throw in either a Dirt Dog heavy-duty shop-vac bot or a Looj gutter cleaner for free. Both of those go for around $130 on their own. Ultrasonic whistle for controlling your new robo-brigade not included. [iRobot Store via CNET]