My thrift shop had a basket full of external usb keyboards the other day. Too bad you don’t live here.
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No problem. It's still under warranty, and Apple is not only replacing the keyboard, but the entire upper cover to which it is attached -- which includes not only a new trackpad, but new batteries!
Not bad for a very heavily-used, almost three (3) year old MacBook Pro...
Basically, a brand new Mac for one stuck key! '-)