| Business | Phone |
| Dykstra Electronics 1209 Borden Rd, San Marcos 92069 | (760) 744-1216 |
| Airco Electronic Gases 1970 Diamond St, San Marcos 92078 | (760) 471-1541 |
| Best Buy 567 Grand Ave, San Marcos 92078 | (760) 891-0755 |
| R F Parts Co 435 S Pacific St, San Marcos 92078 | (760) 744-0700 |
| Radio Shack 314 S Twin Oaks Valley Rd, San Marcos 92078 | (760) 591-3634 |
| Fry's Electronics 150 S Bent Ave, San Marcos 92078 | (760) 566-1300 |