I wish you could buy just enough for a couple of batches. The jar I got is pretty dang big and it put like 15 bucks or something extra on my grocery bill I think I am going to get some strips for the next batch and see whats up.
+1 on this. I did buy a jar and used it, but then went to using fancy pants excel sheets to adjust my water. Now I have 3/4 of a jar of the stuff. We should just start the black market of passing around used jars of the stuff, so people can try it to see if it works for them.