Big-box music stores are all right, but sometimes it pays to venture into the unknown, and for musicians, the right place to set out to is North Miami's Sim Music. This neighborhood institution has three floors of new and used merchandise; from DJ equipment to amps and guitars, this place has the coolest selection of new gear. With a couple of hours to spend, you might find a used Technics SL for $300 as well as brand-new guitars and amps under the $200 mark. The staff is not only well informed but also friendly, meaning you'll get plenty of knowledge on that new purchase.