The Legacy of the Void campaign cannot be purchased individually through the in-game StarCraft II shop. The price is displayed as “??? 0.00,” preventing purchase. Workarounds suggested by support, including game reinstallation, have failed. The only alternative, the StarCraft II Campaign Collection, is overpriced at USD $30.76 (compared to $39.99), offering minimal savings despite the user already owning the other campaigns. This issue blocks players from accessing and purchasing the desired content.
use the blizzard website not the ingame store its glitchy and dont always work.
The Blizzard website doesn’t allow buying individual campaigns - only the bundle. The bundle is, as stated, outrageously overpriced.
Blizzard could trivially fix this by adjusting the bundle to something reasonable.
It’s less that it’s overpriced and more because the Collection includes the four Coop Commanders.
As for store, as winter said, the in-game store is wonky and has been for a long time. Unfortunately, there’s been no word of it being fixed and there’s no way to work around it.