For the Mozart, you can find an Edwin Fischer recording that is nto very expensive! The sound quality is less than modern but that doesn't bother me.
If you want someone still alive, I recommend Mitsuko Uchida on the Philips label.
Another favorite of mine, who plays the piece in a totally different way, is Friedrich Gulda, and I bought his CD of Mozart 20 and 21 for $7.95 or something like that.
Walter Ramsey