We just got a shipment of these extremely hard to get battery's. They have been on heavy back-order for months.
http://www.evsonline.com/canon-lp-e6-battery-pack-for-canon-5d-mark-ii-digital-slr.html
http://www.evsonline.com/canon-lp-e6-battery-pack-for-canon-5d-mark-ii-digital-slr.html