| Business | Phone |
| Avi Systems Sioux Falls 57104 | (605) 336-0689 |
| Esp Architronics 7224 W Lancaster Cir, Sioux Falls 57106 | (605) 362-8080 |
| Innovations Inc 4500 E Oakwood Pl, Sioux Falls 57110 | (605) 339-7211 |
| Mid States Audio Inc 4012 N Hainje Ave, Sioux Falls 57104 | (605) 331-4001 |