It could be a great marketing ploy, but I've always thought that there weren't "generic" options when it comes to Bernina machines.
But I looks like I'm wrong:
This is only $6.99. Huh??
http://www.amazon.com/Bernina-Bobbin.../dp/B002BGKC6S
And this, which looks like the same thing, is $34.99-
http://cgi.ebay.com/ws/eBayISAPI.dll...793#vi-content
I was once quoted $55 retail for a bobbin for my 150 - and that was years ago.
Well, if your Bernina dealer who serviced the machine says it's alright to use the lower priced bobbin, even if it's not OEM, then go ahead and try it.