Before today the only way to pre-order an extra Stadia controller was if you already purchased the $130 Founder’s Edition. As of this morning, Google is now offering a standalone Stadia controller to anyone for $69 plus shipping, though there is a catch, only those that own access to the Founder’s Edition will be able to make use of the device before the public release of the game streaming service in 2020.
You won’t be able to play Stadia right away just by purchasing the Stadia Controller. Only purchase the Stadia Controller on its own if you already have access to Stadia through Founder’s Edition and are looking for a second controller, or if you have access through a Buddy Pass and want to use the Stadia Controller.
As you can read in the quoted text above, Google has made it clear that the standalone $69 peripheral will be of no use to anyone that hasn’t paid for access to the Founder’s Edition. Of course, those that plan on accessing the streaming service through…
https://www.androidpolice.com/2019/06/17/stadia-controller-pre-order-google-store/