Same here! I shall be taking mine in soon for a service as I'm nearing 18 months and I do use it rather a lot!
I did manage to get some more bobbins for it last month at the festival of quilts here in the UK so I have at least solved that issue! I did manage to get away with using some singer bobbins before I got them though. Can you find a juki dealer in the US that may be able to send you some bobbins?