Quite by accident I happened upon this 4CD set of La Belle Helene in the local MediaMarkt - not the kind of place you'd expect to find such music.

In the box: Credo, Chopin/Rachmaninov; Reflexions; and (ta-da!) her recording of Beethoven's 5th Piano Concerto.

OK, you miss out on the booklets containing her thought-provoking essays, coiffure & carefully chosen outfits but at 17 euros for the lot you can't complain too much.

I'd not seen this listed on any of the Amazon sites (maybe deliberately?) so it's worth scouting around in the record shops - those that remain, of course.