Just ordered a 2600mah on ebay for around $21 shipping included.
Top Quality Replacement Battery
for VX6700 made from Japan cells; Capacity: 2600 mAh;
Voltage: 3.7V;
Chemistry: Li-Polymer;
CE and SGS-ISO-9001-2000 Certified
Had the battery for a week, after 30 hours of use it still at 90%. Comes with a nice back cover that actually stays on . Only down side is the battery wont fit out of the phone in my cradle charge, have to charge it in the phone. got it from http://stores.ebay.com/Broadway-Electronics