https://www.bundlestars.com/en/bundle/quake-bundle

10€ for these rare old games.
(Region-locked game - This Steam key will NOT activate in the following regions: Germany, Austria, Switzerland, United Arab Emirates, Saudi Arabia, Kuwait, Bahrain, Qatar, Egypt, Lebanon.)

edit: also Wolfenstein New order is - 85 % - 7.50€ on Steam, great shooter fun for that price (very slow but still a very good game imo)