Another source of authorized trained technical help as well as repair and replacement parts for portable Apple computers in your region (North Carolina) could be a highly regarded company by the name of wegener media & if you put those two words together and add dot com, that's their web site. I've had very good experience with them by Mail, across the continent from Alaska; they have good personable customer service, too.
They can also repair in-warranty issues (if you drop a Macbook, for example, and that damage isn't under AppleCare) that otherwise may void the rest of an original warranty; they are qualifed and have many parts.
Thought I should add this; although they do have parts and power adapters, their better price on these usually is part of a package when one is seeking to buy a refurbished computer from their stock. From reports on NewerTech batteries, the OWC company may be the best way to go since the specs suggest longer battery life. However, distant/regional issues of my dealings with OWC by email and phone suggest a limited ability of them to be competitive this far away from their main customer base.
So, I've looked elsewhere for replacement parts, RAM, drives & external backup devices. I have OWC products that have failed, in boxes here. They don't offer answers or support them now. And while my iBook G4 (mid-2005) 12" portable computer is in the market, too, for a replacement battery, I am saddened by OWC's odd web page and phone ordering issues. And I can't use the OWC products I already have. They've become inert...!!
Good luck & happy computing! 🙂