Bob, I also purchased my 1st mop, but have made another 3 of various grits just using a bolt as a mandrel. I usually get one or two refills when ordering from Kligspore as the refills are not too badly priced especially when you add in the cost of cloth backed paper and the time taken to cut and punch all the leaves.
The last me for a long time, as I now mostly use Mac Mops.