I have a artista 635, can you use bobbins other than Bernina?

There are non Bernina bobbins on sale to fit Berninas on ebay
Check to see if your machine is listed.

I have an artista 185 and the ones I got on e-bay work just fine. I can't tell the difference between authentic Bernina bobbins and the others (except for the price). Just make sure you get the ones that fit your particular machine. I would ask the seller first if they fit your machine. Hope this helps.