AMD has made the pricing and availability of the Ryzen 7 5800X3D based on 3D V-cache technology official. The Ryzen 7 5800X3D will be available for US$449 starting April 20 worldwide. Apart from the 5800X3D, AMD also introduced several budget offerings in Ryzen 4000 and Ryzen 5000 series.
https://www.notebookcheck.net/AMD-Ryzen-7-5800X3D-gaming-CPU-now-available-for-US-449-alongside-six-new-budget-Ryzen-4000-and-Ryzen-5000-processors.608095.0.html