In the US as of 2011, the least expensive batteries are from $45 to $60 USD, but some cost closer to $100, or possibly more, depending on the quality and capacity.
About 60% of the weight of an automotive-type lead-acid battery rated around 60 Ah (8.7 kg of a 14.5 kg battery) is lead or internal parts made of lead; the balance is electrolyte, separators, and...
Depending on what kind you get, I have seen some for 30$ to 109$
I would go to this site http://www.autozone.com/
put in your vehicle information to give you a better idea