At this time, we have a bug preventing the purchase of Sha-Infused Pack upgrades for Mists of Pandaria Classic.
We are aware of the issue and working to resolve it as soon as possible.
It says “WoW Classic General Discussion”.
As a non-Classic player looking to buy this item, this felt like the right place to come.
Damn and I was wondering, why I cant buy it.
Btw: We need more Sha in Hearthstone too! 
This issue has now been resolved.
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