The majority of public toll operations make available electronic pass systems that are quicker and easier for you to pay the fees. Tonic Concepts sells a variety of elegant cases that will fit all major transponder variations. Each can be attached with your choice of a non-permanent dash mount, or with 3M Velcro strips that allow the cases to be mounted to the windshield. Prices range from about $8 to just over $20 each, with discounts available for multiple-case purchases. The full range of transponder case designs can be viewed and purchased at www.tonicconcepts.com or at www.myshopify.com.