James,
1. The ones in this pic
http://kms.nfshost.com/information/batteries/
2. From the Kirkhams.
3. Not sure on price, got them when I got the car.
4. So far, I'm ecstatic. And I really like the batteries too.
I've also seen some red top Optima's made in this same shape that look nice that others are using.
David