For various and complicated reasons I have not one, but two Griest buttonholers (Model 1 - side screw clamping, the most common one, fits most machines) that I'd like to sell!! These take the metal cams.
Between them I have one complete set of all the templates including the extras except the eyelet plus one set of the 5 regular templates. One buttonholer is the older black metal model, the other the blue plastic one. Both have boxes (slightly dented), and there is one manual. I know the blue one works because I've used it, and the black one moves the way its supposed to, so it also ought to work. I've given both an oiling and cleaning.
I'd say £20 plus postage for one (chose your colour) with the complete set of templates, of £15 for one with the 5 templates.
You will need to provide your own thingy to screw it into. I think this was part of the setup of the older machines, on my Bernina 1008 I use a screw on foot attachment.