Dutch online retailer Centralpoint.nl is already offering tray versions for AMD's top-of-the-line 65 W Ryzen 4000 desktop APUs. These are Euro prices, but we can estimate that the Ryzen 7 Pro 4750G 8-core / 16-thread should cost around US$300, while the Ryzen 5 Pro 4650G 6-core may be priced at around US$200, and the Ryzen 3 Pro 4350G quad-core may end up costing around US$150.
https://www.notebookcheck.net/AMD-s-Ryzen-4000-desktop-APUs-already-available-at-Dutch-retailer-tray-model-prices-revealed.479510.0.html