That's a decent price if it's what you're looking for. If you wait you should be able to find some 3300's for around the same price. Gotta be careful with ebay buys though. My buddy got some ebay batts, they work good. So did I. Another guy around here got some, and it blew up in his face while charging. Burned his face, and had to have skin taken off his eyes. Yech. But who knows, coulda been the charger.
Anyhow, you may find better deals on forums that you frequent. Anyhow, they should fit in your buggy and run one at a time.