Here you can register for a collective order of an eBUS adapter.
There are still some adapters available directly in the following shop, which is why a reservation is unnecessary at the moment. I.e. just order there directly:
eBUS Adapter Shield v5 at Elecrow
An enclosure is available there as well.
As soon as these are gone, you can reserve them again here.
Information can be found in the documentation.
The adapter v5
allows being used via USB, WIFI, Raspberry Pi,
or Ethernet (USR-ES1 module NOT included!).
Comes with an eBUS plug but without a USB cable.
For Ethernet, an additional module is needed that is NOT included, see the docs for details where to get it