where do I get a battery for my car and how much should I pay on 2003 Cadillac CTS

my battery is dead. can't start without a jump.

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3 answers
actually Wal-mart does not carry this battery, it is a group 101 type. Autoparts stores carry this type runs about $180, but you can also get it for $165 @ batteriesplus
About 120 for the battery. You can get it for this price and maybe a little better at Sears or Wal-Mart or maybe autozone.
buy a good battery. most any parts store will carry it approx 135.00