You will probably spend as much, if not more for a taxi. I would book the towncar service. Plus, as Ducklite mentioned, you will get a free grocery stop if needed.
and we would of had the option of stopping at a store if we wanted to......the amount of a town car vs a taxi was about the same ....but no stop with a taxi cab......there is also a coupon for five dollars off their amount......on their site.....