I don't have any links for assembled boards, but there seem to be some available [1]. You can find the PCB files here [2] including more documentation. The same page also has a Telegram group link to find people near you who might be able to help out.

I got my PCBs made via JLCPCB, but there are other options as well. Pay attention to select the correct PCB thickness, noted in the Readme. I fell into that trap and had to order again. Sourcing the USB port with the correct footprint was a bit annoying, I just ended up ordering a selection of kits with multiple variants from Aliexpress.

[1] https://news.ycombinator.com/item?id=45699184

[2] https://github.com/Hypfer/valetudo-dreameadapter