I Searched on this site and got the Cheapest Hotel,Check it out,it also had Discount Coupon Codes for Expedia,Orbitz,Travelocity,Kayak, Priceline,etc.http://freetravel4ever.blogspot.com
There are a number of extended-length hotels in Jacksonville that are relatively inexpensive and come fully-equipped with kitchens and the like - would cut down on your dining costs to boot. Weekly rates are somewhere around $175 and up iirc. Just the ones I know of off the top of my head:Suburban InnExtended-Stay AmericaInTown SuitesHomewood Suites