Help me pick a cheap phone with best battery life

I am looking for a new low (or no) cost phone for my wife. She needs:
1) Superb battery life
2) Flip phone
3) Bluetooth

Any suggestions? I was looking at the LG Fusic - it has the longest talk time at 4.5 hours.

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I would take a look at the Sanyo Katana II (SCP 6650). I got one for my boyfriend and it's an excellent phone. The battery life is impressive, it is a flip model and it has bluetooth, camera and a GPS. It's also a nice looking phone and it is sturdy. Voice calls are clear and data transfer is great in our area. I got my boyfriend the silver one but it also comes in black or pink. I got my boyfriend's through employee pricing (I work for Sprint) but it's listed at 49.99 right now on sprint.com and you may get more discounts when you purchase it.

Hope this helps!