Nintendo wont release it seperately. Despite whether you want the game or not, the only way you will get the disk without TWW is not going to be retail.
Amazon made one of the worst deals ever. They give you TWW, and the bonus disc for $50. But they also offer just the bonus disc for $70. One less game for 20 more dollars? Even if you dont want TWW, its a worse deal...oh well...
If there are extra after pre-ordering stops, on the day of TWW's release, they will likely include with non-preorders to they run out.
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