My advice is to check Ebay, maybe the local want ads, and Facebook marketplace, because people are selling those things all the time and unless you want to pay retail price.... look at the used market. Also yard sales are places where you can often find a decent keyboard at a really good price.

Sometimes you can find used gear on the bulletin boards in music stores.
You can find my music at:

Add nothing that adds nothing to the music.

As the sword chooses the warrior, so too, the song chooses the writer.