Sadly, in this case Apple is the still the only source for parts. Mostly, AppleCare covers issues under warranty.
Apple did have a recall on the keyboard in this series so you should see if you can get it replaced for free if you didn't damage it.
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* [https://support.apple.com/keyboard-service-program-for-mac-notebooks|Keyboard Service Program for MacBook, MacBook Air, and MacBook Pro]
Even if you did damage the keyboard and AppleCare is still active, you should see if you can sign up for AppleCare + it will extend your coverage and help cover some costs. And lastly, depending on the country which you live in (and bought the system) you might have extended coverage dictated by law.
The newer model parts are always a good year or two before you'll find them on the open market (with rare exception).
Can you tell us what happened here.
Sadly, in this case Apple is the still the only source for parts. Mostly, AppleCare covers issues under warranty.
Apple did have a recall on the keyboard in this series so you should see if you can get it replaced for free if you didn't damage it.
Even if you did damage the keyboard and AppleCare is still active, you should see if you can sign up for AppleCare + it will extend your coverage and help cover some costs. And lastly, depending on the country which you live in (and bought the system) you might have extended coverage dictated by law.
The newer model parts are always a good year or two before you'll find them on the open market (with rare exception).