| Business | Phone |
| Avac Systems 210 Van Houten Ave, El Cajon 92020 | (619) 444-4517 |
| D & M Security Cameras 9343 Bond Ave, El Cajon 92021 | (619) 440-5570 |
| Electronic Security Systs El Cajon 92020 | (619) 588-6964 |
| Alarm & Camera Technology 111 S Marshall Ave, El Cajon 92020 | (619) 469-5283 |