Rent prices range at military housing in Jacksonville, depending what you are looking for. You can easily rent one bedroom in a multi-bedroom unit for around $500 a month, but there are several luxury apartments that run up to $2000 per unit. Over all, it is relatively inexpensive to live in Jacksonville.
What about going out to eat or have a few drinks with friends? Jacksonville is cheaper than most large cities but, again, it depends on where you go. There are local bars near both bases with very reasonable drink prices.