For any of you looking to get batteries just before competition I just talked to Battery Universe over the phone and they offered a $5 off discount per battery for FIRST Teams.
THIS APPLIES TO CALL IN ORDERS THAT IDENTIFY THEMSELVES AS PART OF A FIRST ROBOTICS TEAM. (sorry for the caps I just don't want anyone missing this important fact)
EnerSys Genesis NP18-12B Sealed Lead Acid Battery
Normal price: 69.95
Reduced price: 64.95
Also, they ship from Minnesota so bear that in mind when calculating shipping costs/arrival times.
http://www.batteryuniverse.com/
800-995-9750