Today's Circuit City flyer shows that you'll save $20 on the purchase of two Xbox Live accessories $19.99 and up. This means that if you purchase two Xbox Live 1600 MS point cards at their $19.99 price, you'll get one of those for free. So, that's 3200 MS points for $20 -- we'll take it! We also called two separate Circuit Citys to confirm that the deal was accurate.
http://www.joystiq.com/2007/07/29/3200-ms-points-for-20-at-circuit-city/
http://www.joystiq.com/2007/07/29/3200-ms-points-for-20-at-circuit-city/