Hi, I have a FW. DH bought it from Jean S. Lyle, he and his wife have a booth at most of the big shows.
I pulled out the parts list which lists all parts that can be replaced and a new bobbin case is $45. This price list is 2 years old. If you would like more info private message me and I would be happy to email you a copy of the list.
I love my FW, but please be informed about the cost of bringing it up to speed, it could be more trouble than it is worth.
Good luck