I can't think of anything for me, other than the regular sale stuff.
For example:
Picking up Galactus for 30% off
Getting Astonishing Wolverine and Absorbing Man for BOGO1/2
$2 Captain America Figures
But my friend did get a great deal at Sears of all places. We were in there one night and he picked up a Transformers Human Alliance Dale Earnhardt Wrecker for $12.49. The tag on the box said $34.99 which was a deal since it was $44 at TRU. But when the girl scanned it at the till it came up as $12.49. Obviously there was an error in their system, but he just paid, smiled, and walked away.
That was a crazy deal.