It should have about 600 CCA (cold cranking amps). Walmart is $119, Autozone is $129. Both have similar warranties. Call around, you may find something on sale. All batteries are made by similar factories, so the name doesn't really matter.
If you replace the battery yourself, always take the negative (black cable) off first and put back on last. The only difficulty may be undoing the bracket holding the battery in. Good luck.