| Business | Phone |
| Best Buy 7300 Guilford Dr, Frederick 21704 | (301) 662-6130 |
| Circuit City 5606 Buckeystown Pike, Frederick 21704 | (301) 682-8466 |
| Electronics Technology Planar 5715 Industry Ln # 11, Frederick 21704 | (301) 662-5019 |
| Radio Shack 1301 W Patrick St # 2453, Frederick 21702 | (301) 663-6345 |
| Radio Shack 1305 W 7th St, Frederick 21702 | (301) 694-9166 |
| Radio Shack 5500 Buckeystown Pike, Frederick 21703 | (301) 694-9119 |
| Sac Tech Micro Devices 4580 Mack Ave, Frederick 21703 | (301) 668-1133 |