Bobbins are not the same as the Class 15 for this particular machine. Though maybe a class 15 would fit, have not tried it (but I think they are too tall).
It's actually made by FREE, so look for bobbins that fit a Free Rotary. I've got a few handfuls of them laying around - somewhere . . .
New Home got bought out and turned into a "badged" name. What fits this machine is not the same as a Rotary New Home that was made by New Home, or one made by Janome.