Another free sampler from Amazon: X5 Free Classical Sampler - Chopin 200 Years, by Various Artists.
About 30 minutes long.
Reviews, track-samples and download-link here.

Track-list:  1. Nocturnes, Op. 9: No. 2 in E-Flat Major  Vitaly Margulis    4:34 2. Waltzes, Op. 64: No. 1 in D-Flat Major, "Minute Waltz"  Vitaly Margulis    1:53 3. Sonata No. 2 in B Minor for Piano, Op. 35: IV. Funeral March: Lento  Vitaly Margulis    8:14 4. Andante Spianato et Grand Polonaise Brillante, Op. 22: I. Andante Spianato in G Major: Tranquillo  Jura Margulis    4:56 5. Andante Spianato et Grand Polonaise Brillante, Op. 22: II. Grande Polonaise Brilliante in E-Flat Major  Jura Margulis    9:32