Car rental agencies all have different policies about state to state. You have to let them know in advance what your plans are, and it costs a lot more if you don’t bring the car back to where you got it. All the major rentals, such as Hertz, Enterprise, Avis and Budget use only newer cars. The so-called “Rent A Wreck” places that rent older cars usually don’t let you take them out of state, because they don’t have return agreements with other agencies. For the cost, again, each agency has their own policy, but I would say from $50 at the low end to $150 at the higher end per day, which includes all the insurance. You often have to make a very large cash deposit if you do not have a credit card.