| Business | Phone |
| Cosmos Business System 727 Brea Canyon Rd # 7, Walnut 91789 | (909) 468-2028 |
| Elite 150 Commerce Way, Walnut 91789 | (909) 595-0850 |
| National Computer 20947 Currier Rd # C, Walnut 91789 | (909) 444-7841 |
| Btos Technology 675 Brea Canyon Rd # 6, Walnut 91789 | (909) 839-0363 |
| Computer Emporium 442 Vista Rambla, Walnut 91789 | (909) 468-4833 |
| Cpc.Net 784 Nogales Ave, Walnut 91789 | (909) 839-7005 |
| Hrc Technology 667 Brea Canyon Rd # 12, Walnut 91789 | (909) 598-8553 |
| Jen Len Monitor Repair 3960 Valley Blvd, Walnut 91789 | (909) 869-7673 |
| Microtech Graphics Inc 20639 Lycoming St, Walnut 91789 | (909) 598-2425 |
| Soeasy Tech Communication 20569 Valley Blvd, Walnut 91789 | (909) 598-3113 |