Both Regency Solitaire and Regency Solitaire II are discounted this week as part of the Wholesome Games Celebration!
https://store.steampowered.com/app/351090/Regency_Solitaire/
https://store.steampowered.com/app/2137470/Regency_Solitaire_II/
Source: Steam Community (opens in a new tab)