Price 159$ on Unity Asset Store: https://assetstore.unity.com/packages/3d/vegetation/speedtree/desktop-trees-package-24350
But now you can download Desktop Trees Package FREE.
Desktop Trees Package v1.3
These SpeedTree models feature seamless LOD transitions and scalable wind effects that work in Unity out of the box. Package includes:
• An assortment of summer, autumn, winter, juvenile, and bare versions in desktop resolution.
• 190 high-res diffuse/normal/specular maps.
• 24 leaf map maker SPM files (details).
Create limitless variations of each model or design something completely new with a $19 USD/month subscription to the SpeedTree Modeler.
What makes SpeedTree models more than just a mesh?
unityassetcollection.com – Get all paid Unity Asset for free