These are the states that participate in EZ Pass.
(click)Maryland charged me for a transponder (I remember it to be around $40 bucks) and a $1.50 fee per month. The batteries go dead in the things after 4 or 5 years, so you get the privilege of buying as new one.
Either way, pick up an I Pass or EZ Pass. You get discounted tolls and you save a lot of time using it. You can close the account if you don't need it anymore.
EZ Pass and I Pass rates and plans vary from state to state. Indiana I Zoom (which is in the EZ Pass family)will send you as many transponders as you want free. And there are NO FEES if you use a credit card and a checking account as a back up.
Phone 1-888-iZoom90 (1-888-496-6690)