Looks like Gamestop is doing their own Smash Bros add on

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OfficerRaichu15 said:

http://www.gamestop.com//wii-u/consoles/super-mario-3d-world-wii-u-32gb-deluxe-console-super-smash-bros-bundle/118798

its the 3d world x nintendo land bundle with the smash bros gcn bundle

so that brings us to 2 major retailers doing smash bundles(plus its starting to pick up in ranks)

There doesn't seem to be any discount over buying the two separately so it's not really a bundle.