Some of the previous coupons on Amazon US are back up for the time being. So if you missed out on the Wedding of Cyclops and Phoenix for cheap it is back again for example
https://www.amazon.com/gp/product/1302913220 or get the Metal Gear Solid Art book for cheap or whatever.
They also have the 3 for 2 offer going
https://www.amazon.com/gp/promotion/AA1XVC0W3932J? They have Hulk by Peter David Omni & Blackest Night Omni for example. Or off beat stuff like the Marvel Encyclopedia or LoZ Encyclopedia etc.