The Rand-McNally Road Atlas that WalMart sells has WalMart and Sam's Club locations (but not FJ or campgrounds). The price is only $5.97.
There are a couple of books available that show what services are available at interstate exits. These can be used to supplement any map information in the atlas. The names of the book change as different publishers take over. It used to be called "Exit Authority", I seem to remember one called "The Next Exit", and the one we have now is called "The Ultimate Travelers Exit Guide" (2007 Edition). We pick up a new version every few years at an RV rally or RV show, but you might be able to find one on Amazon.com or even at your local book store in the travel section.
We use DeLorme Street Atlas mapping software for trip planning. You can download custom points of interest for many categories including WalMart, FJ, campgrounds, state parks, Cracker Barrel, etc. The price of the software is $39.95. Of course, if you want to take the DeLorme maps along on your trip, you need a laptop computer.
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