get your xStation - x-station/xstation-releases GitHub Wiki
The xStation can be ordered at the following shops:
[USA] https://stoneagegamer.com/flash/playstation/ode/xstation
[France] https://shop.modinfrance.fr/en/playstation/54-357-ps1-xstation-optical-discdrive-emulator.html
[Germany] https://dragonbox.de/de/everdrives-flashcarts/xstation-cd-laufwerk-simulator-ode-psx-pu-18.html
Update: I'm glad to say that there's now also many small and large shops that stock up a few kits for resale. You might find QSBs or full kits with them. Here's one in the UK, for example: