Granted CD Warehouse is a chain of stores. Yet unlike Home Depot or Bennigan's, the four used-CD peddlers in Miami-Dade County reflect their communities. This is true because their suppliers are their customers. Ergo the CD Warehouse in Miami Lakes has a high concentration of Latin music, which mirrors the salsa-loving population in the north end of the county. In Kendall kids trade CDs of Gothic and industrial music. The Coral Gables store, located near the University of Miami, carries numerous alternative and hip-hop discs. Our favorite is the Biscayne Boulevard location, which boasts a fine collection of Motown, reggae, blues, and plain old rock and roll. Here you can find everything from rarities to your favorite greatest-hits compilation. And there is enough turnover that a weekly visit is worthwhile. Check this out: When you buy ten discs, the eleventh is free.