KI always brings bundles online as more are introduced. As more bundles are added to stores, those bundles are pushed out of the stores then added to the online store. They are then in the online store until they are pushed out by bundles being added online. While these bundles are online, there will most likely be a sale. After the bundles are pushed out of the online store, they only become available through throwback thursday's or bundle-a-palooza's.
