Some authorized resellers purchased blocks of 2021 perpetual licenses before Trimble discontinued them. These resellers may still have unsold keys. Expect to pay a premium (often above original MSRP). Verify the reseller is on Trimble’s authorized list to avoid scams.
The SketchUp Pro 2021 license is more than software; it is the last bastion of digital ownership in the Trimble ecosystem. Treat it wisely, and it will power your designs for the next five years. Sketchup Pro 2021 License