I saw in Circuit City’s weekly sales flyer, they had listings for a couple of models of Roomba. They listed:
iRobot Roomba Red Robotic Floor Vac WEB ID:4210 $279.99
also available
Romba (sic) Discovery Robotic Floor Vac WEB ID:4100 $149.99

$149.99 for a Roomba Discovery is an awesome price, but problem is that 4100 is the model of the Red Roomba (older model). 4210 is the the model number for the Discovery. So Circuit City screwed up. I doubt they will honor the price, and will probably just post a note on the door about a mistake in the ad. But at $149.99 I considered going and picking up another Roomba, and returning the first one I bought from Amazon.