Thanks for the advice everyone. Unfortunately it looks like things are severely limited due to the dropoff points available in Cumberland. From everything I've been able to find, there's a Hertz dropoff (Wayne's Citgo) and an Enterprise dropoff, which looks to be closed on Sunday and Monday (the days I plan to get started). Also it looks like Hertz doesn't have a pickup point at Union Station. And after checking on carrentals.com I got the same rates, so no love there either. Oh well, the price is a little on the steep end, but I can live with it.