thorne, have you tried simply emailing Entourage support and asking if they have a battery lying around that you can pretty please buy? I know that in earlier times, they've been known to help people out for things you weren't supposed to be able to do through them, but that they could manage to get done.

If anyone has a stack of these things lying around, it's them. I would think if they did have any stock, they'd be more than happy to offload it.