One of the GoHastings sales, where a coupon granted $5 off your order, effectively making a large number of $4.98 games a $0.02 profit, leaving only s&h. Grabbed about 8 games before the coupon stopped working for me.
Also, Target's B2G1 sale on Kinect games, then stacking a 15% off code, effectively making each game about $25. Not bad for launch week.