[appleuser43242]

Check with your local Apple authorized service provider (AASP)! At least in the US, they can still order those keyboards from Apple as repair parts. You don't need a computer serial number (or maybe you do, but the AASP can just stick a serial number on it). Pricing should be the same as the original retail MSRP, but it's possible some AASPs could add a markup if Apple allows them to (which I don't know).

AASPs were also able to order the iMac Pro space gray keyboards the same way, back when they were exclusive to the iMac Pro and weren't sold standalone.

Apple low-profile keyboards have been my keyboard of choice for over 10 years on any platform and for any use (gaming included). I know a lot of people swear by mechanical keyboards, but personally I type much faster with the low-profile keys and love the feel of them.