You could make you own ice and save $2. You could also net your own bait (shiners, etc) or take a walk after a rainstorm and collect some worms and save $5. Since you are packing ice already, you should pack your own cold bottle of Perrier and home-made sandwich and cut that $5 to about $2.50 or less. Total savings about $9.50 or more or about 30% of your cost.