depending the age and miles on your car, you might want to change the water pump too. indy might charge you 3 hours something on water pump. so, maybe $500-$600 something with OEM parts? you can also get aftermarket parts online(autohausaz is reputable one). aftermarket parts might save you like $100 something.

it's actually not too bad to diy if you're mechanically inclined. there is an diy on this site.