Over the years I have felt, at times, the cost of ice for the cooler has significantly added to our food budget. We have traveled with a battery operated refrigerator, but found them too small, not cold enough and not good for extended days of not driving to recharge.
On this last trip I did some research and found that the national chain, Ice House of America, has a website that lets you find locations along your route.
These are the free-standing 'ice houses' you see as you travel through towns. For us it has always been hit or miss in finding them. So to have a resource to plan ahead is great.
On this trip a 16 pound bag of ice was $2 and if you wanted to load directly into your cooler you would get 20 pounds for the same $2.
If you are a member of Costco I have purchased a 20 pound bag for $1.67 to $1.75. Not all stores have ice.
As I don't want to promote just one or two companies I hope others will share other resources for ice.