UPDATE: Looks like it went OOS online (maybe intentionally), so YMMV if you can find it for store pickup; otherwise DEAD.
Green Monday, Target has the iRobot Roomba 890 on sale for $399.99 with an additional $20 off for every $100 purchase. Add a filler (e.g. candy) for about a buck or less to get over $400 and your net price will be ~$321 + tax.
Use your RED card for an extra 5% off or if you have gift cards from the 10% promo, use them to get it for even less! Using a referral site could also net you an extra 1%.
This is a better model (Wi-Fi enabled) and price than the 805 currently on sale at Costco, though this comes with one less virtual wall unit and without the Costco return policy.