um no; that's a reason to upgrade the battery, not get a new laptop
It'll probably be around $200-$300 if you want an official battery. More like half that if you're willing to accept a 3rd party one.
Even if a local shop somehow sourced a legit, new Apple battery, why wouldn't I go to the Apple Store if it's the same cost and would only be the battery?
(For $299, Apple replaces the speakers, touchpad, batteries, top case, and keyboard and provides a parts and labor warranty for 90 days)