Vault-Tec Workshop Price
Vault-Tec Workshop is a lot cheaper than Far Harbor and a little bit cheaper than Automatrom.
Like Fallout 4's other Workshop DLCs, Vault-Tec slots in at the usual $5 price point. That means £3.99 GBP and $6.95 AUD.
This will be the price if you plan to buy it on its own. It'll also be a part of the $50 Fallout 4 Season Pass that's still on sale at retailers around the world.