It is a question if it was necessary to revive almost ~2 yrs old thread, but there is this thread, which I created:
You can see that our distributor Discomp.cz is selling both Turris Omnia and Turris MOX power supply, in cases such as if it is lost or damaged. Also, it is available in retail. I checked it, and many sellers have it.
We recommend using only our power supply with our products, not others, to prevent any issues which could appear.