The most you've paid for a normal adult female ball?

[BoidKeeper]

What's the most you've paid or heard that someone has paid for a normal adult female ball? Some people say that an adult female ball could command as much as $400 depending on her size. Has anyone actually paid this or know someone who has? The most I've paid and charged was $200.
Oh and were these normal females proven or not?
Cheers,
Trevor