Don't ask the salespeople for help in the jazz section at these longtime Valley record emporiums; they're likely to scratch their heads and walk away in confusion. But if you know what you're looking for, or just love the notion of exploring a well-stocked record store by yourself (and don't want to spend a fortune), you're bound to have a bebopping good time at Zia. For example, take the letter "D." We found a ton of Miles Davis, Djavan, Dirty Dozen Brass Band, Barbara Dennerlein, Eric Dolphy and many others, all for under $12 a pop. Now, if only the help knew that Thelonious Monk was a piano player.