Perhaps a couple years too late, but the MMO WildStar is now available on Steam. The game is free-to-play as of September 2015, and recently updated with the "Vault of Archon" content.
There are some optional DLC purchases for the game priced at $19.99 (USD), $49.99, and $99.99.
There are some optional DLC purchases for the game priced at $19.99 (USD), $49.99, and $99.99.