Google now offers the Stadia Premiere Edition, which includes a Stadia controller and Chromecast Ultra, for US$99.99. This is a $30 cut from its previous pricing. However, Google has also killed the three-month trial period of its Stadia Pro service that used to be included with the purchase of the Stadia Premiere Edition kit.
https://www.notebookcheck.net/Google-cuts-price-of-Stadia-Premiere-Edition-to-US-99-no-longer-offers-three-month-free-trial-of-Stadia-Pro.476663.0.html