Turissa machines are few and far between where I live. I think you might have to oder from Germany or
Switzerland where these machines are more common. They are very good machines, I'm sure you will like yours once when you get more familiar with it. I am a bit envious of your find
At some point Husqvarna Viking bought up Turissa and there are a few models carrying both names, I'm not sure if bobbins for these are compatible. There is a single seller on fleabay seller this type of bobbin, you can always ask if they have the same dimentions. As far as I know, the Turissa Novomatic, Ultramatic, Automatic, Swissmatic take the same type of bobbin. Some later Gritzner models are suppose to take the same bobbins as Turissa, but so far I haven't been able to verify it. Odering will be a sort of trial and error unless you can get very specific dimensions.