Steam has Frontier Developments for their publisher weekend. Up to 80% off publisher titles & more available on steam page. Games on sale:

Planet Zoo – $ 33.74
Planet Zoo Premium – $ 52.96

Frontier 25th Anniversary Collection – $ 88.77

Jurrasic World Evolution – $ 11.24
Jurrasic World Evolution: Premium Edition – $ 27.98

Planet Coaster – $ 11.24
Planet Coaster: Complete Collection – $ 59.23