Cost will vary by the manufacturer and possibly by the service center. In accordance with ARS 28-1462 and A.A.C. R17-5-614, the service provider will collect $20 for each installed or transferred device. All other fees are established by the Manufacturer and service centers. The MVD does not regulate or monitor any fee above the $20 install fee. See Interlock Installation and Monitoring for a complete listing, and choose the one that best fits your needs.