You can use any power supply that has the same specifications as the organelle one has.
I bought min used from UK, I live in Denmark, so I had to get another power supply. I just found one of those multi power supplies I had in my closet that met Organelle specifications. It works fine.
I think this have been up here before, so if you use the search function, I think you will find the exact specifications, sorry I dont remember them.