When you're in the Stadia Store (mobile or desktop) there is a section labeled "Stadia Pro games." This list will update and change each month as games you're able to claim on Pro are added or removed...
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When you're in the Stadia Store (mobile or desktop) there is a section labeled "Stadia Pro games." This list will update and change each month as games you're able to claim on Pro are added or removed. Currently, in this list, are: Destiny 2, Farming Simulator 19, Samurai Shodown, and Tomb Raider (the first one). Shadow of the Tomb Raider is currently on sale (via the Stadia Pro Deals section in the store), in addition to 4 other games. But if you don't have a Stadia account and can't access the store, the only way to know what is currently on sale or which games can be claimed for free is to follow the community site here, reddit, or other gaming news sites. Reddit is a good source. Pretty much as soon as news drops about sales or other info, there is info there.