Best Buy has the iRobot Roomba 770 Vacuum Cleaning Robot for Pets and Allergies on sale for $500 - $100 off with coupon code DoBigThings = $400 with free shipping. Goes for $500+ elsewhere. $50 gift card included with purchase (Automatically added to cart). Features dual HEPA filters, power management and scheduled cleaning, and includes an infrared remote. Normally $500 or more.