you really want to turn heads... buy a whole pallet. I did that a few years ago and people really look at you like you are nuts. ( especially since most people in these parts use LP.) I had to stop on the way home and everybody that walked by my pickup started laughing... until I told them later how much I saved.
a pallet would last me about a year back then, now that I have gone to an UDS and all weber grills, I dont use near as much since the cookers are so tight, about 25-30 bags is all I have been going through the last few years. ( I also added a jumbo joe to the lineup so all the small suppers get cooked on that for even less coal used.)