Amazon has a jazz sampler that can be downloaded free "for a limited time." How limited? I don't know. Featured artists are Pat Metheny Group, The Bill Frisell Band, Gary Burton Quintet, Keith Jarret, Chick Corea, Marc Johnson, Dave Holland Quartet, Jan Garbarek, Enrico Rava, and Charles Lloyd Quartet.
Tracks are at 256 kbps, total playing time 1:11. Get it here.