Dont bother with a repair if you dont go to an authorized repair centre IMO. I believe they include a battery too (last time I checked) Id reach out and discover prices.
The reason I say this is due to the fact 1- you know real parts are being used and 2- you get a warranty
You can also order original parts from https://samsungselfrepair.shop thats what I did it comes with battery as well and the sticker to re-attach back cover glass