Amazon.com is currently offering the complete harpsichord works of Bach, performed by Martin Galling, for 99 cents. This includes both books of the Well-Tempered Clavier, the partitas and French and English suites, and much else. Even if the recordings are not to your taste, you’re only risking a dollar for fifteen hours of music.
The performances, to my non-expert ears, are acceptable but not outstanding. Here’s Galling’s rendition of the Prelude and Fugue in C minor from the first book:
Compare it to Malcolm Hamilton’s
and Takahiro Sonoda’s
Galling is a plodder. I’m being unfair — he usually picks better tempos than he does in that prelude — but there is a reason why he is seldom mentioned in the same breath as Glenn Gould and Wanda Landowska. Still, Galling generally does play Bach well enough to give pleasure, and the set is a good deal. You can indeed find better recordings of Bach, but they’ll cost you much more than one dollar.
For the heck of it, I found MIDI files of the prelude and fugue and ran them through a synthesized harpsichord on my computer: