| Business | Phone |
| Altel Systems Group 3014 N Us Highway 301 # 800, Tampa 33619 | (813) 628-6100 |
| Whitlock Group 8406 Benjamin Rd # E, Tampa 33634 | (813) 886-4444 |
| Professional Communications 5426 Beaumont Center Blvd, Tampa 33634 | (813) 888-5353 |
| Magnum Audio Group Inc 7102 Midland Way, Tampa 33625 | (813) 908-6257 |