ball and socket armatures

I know most people will not be using ball and socket armatures, but here are a few good sites to look at if you are interested. Most of these are for individual parts, but they should have pre-built armatures as well.

http://www.animationsupplies.net/shop/individual_parts.shtml

http://www.jwmm.co.uk/galleries/socket.php

http://www.armaverse.com/products.html

http://www.animateclay.com/shop/index.php?main_page=index&cPath=7&zenid=b553132563a60a4f3ae8bebd0e1204a8