Just wanted to flag for folks that this is still on-going.

The online link says 'Currently unnavailable online' but if you go to a GameStop (or have a gentle soul of a buddy who will do it for you for those of us outside the US right now...) they will give you the discount.

One might even think GameStop knows something we don't...

As soon as they ring up a battlechest and a WOTLK box together, their system automatically discounts WOTLK to zero dollars...