can laptop keyboards be replaced?

I have a 13" Macbook with a light-up keyboard that I've had for around 4 years,and a few of the keys have been damaged or broke off. The functions of the keys still work, but the black key itself has broken off. Wanting to know whether or not if the individual keys or the keyboard itself is able to be replaced. If so, where can I get 'em?

Mac

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