I was quoted 180 for an OEM battery (mind you that's in Canadian funds).
You can get a Yuasa sp? Battery, for much cheaper. I ended up getting a new battery for 100, not 180, so shop around.
You should be able th get the battery out no problem, you usually just lift one edge adn it should slide out. You want to slide it up and towards the rear seat.
Another word of advice, test to make sure it's the battery first. I got lazy and decided it had to be the battery without testing. Turns out the battery was fine, but my Regulator/Rectifier or Stator is actually pouched.
Don't spend money if you don't have to
