Hey there @cresmendoza, that is going to depend on if you plan on replacing the battery yourself, or if you plan on paying a professional to have it replaced for you. If you want to do it yourself, iFixit does have a very nice [product|IF356-336|battery replacement kit], that comes with all the tools, adhesive, and the genuine battery. In total it would run you around $50 USD to replace the battery yourself, not including tax or shipping.