We don't know who's behind the excellent jazz selection at these Valley superstores, but he or she is onto something. The Valley isn't exactly known as a jazz mecca, but to see the selection at Best Buy, you'd think that the late Thelonious Monk was in his prime. Best thing is, the stores aren't fixated on the "smooth" jazz pabulum that's infected the local airwaves for too many years. You want modernists Greg Osby, Don Byron, Joe Lovano, Regina Carter? You got 'em. You want oldsters Ellington, Fitzgerald, or Sun Ra? They're yours for the taking, and the prices are the best in town.