The iRobot Roomba vacuum cleaning robot is still just $139.99 at Buy.com. This is an $80 difference from Amazon where it's priced at $220. The Roomba machine vacuums your entire house on command, calculating the optimal cleaning path, and when finished, it returns itself to its charger - all hands free. It received 4.5 out of 5 stars from 46 buyers. Shipping is free, there's no sales tax (except CA, MA, MD, TN), and new Google Checkout users can get a $10 discount for signing up.