For the ones that will be at or coming down to camp there are a couple of places close to buy minners, one is the bait shop at Sylvarena and the other is there at the interstate at the Shell station. If you are at the campgrounds the one at the Shell is closest.
Also, been several asking about ethanol free fuel. If you go toward Oakland from the I55 exit you will come to a stop sign at 51, keep straight and there will be a gas station on the left a couple miles down the road at the county line.