| Business | Phone |
| U S Computer Products 19200 Chennault Way, Gaithersburg 20879 | (301) 721-9011 |
| Cartridge Technologies 8411 Helgerman Ct, Gaithersburg 20877 | (301) 417-7202 |
| Computrend 15904 Luanne Dr, Gaithersburg 20877 | (301) 926-8288 |
| Mac Corner 8653 Zetts Ave, Gaithersburg 20877 | (301) 330-9116 |