I agree with Kevin, make your own. You can buy wood turners sanding kits from Rockler for 10 bucks when it's on sale, which is now. It is 1" rolls of five different grits.
Cut strips to 3". 24 strips is what I make.
Take two pieces of scrap wood, 1/4 x 1 x 3 inch. Tape them together. Using your scroll saw cut slots 1" long on each side, spaced 1/8" apart.
Drill 1/4" hole in the middle.
Now take 6 strips at a time and sandwich them between the jig you just made. Wrap it in packing tape. Using 1/4 drill bit, drill hole thru strips following the hole in the jig.
Then, hop on the scroll saw and follow the slots that you made. (I use my dull blades doing this, no sense in wasting good blades).
Slice open the jig and repeat process 3 more times.
When finished take a 1/4 x 3 or 4 inch bolt, and cut off the head.
Screw on a nut, then put on a washer, and then put the strips on, alternating up, down, crisscross, every which way. Add washer and nut.
There you have a sanding mop for less than a buck.
With 5 different grits you can have five different sanding mops.
I hope this is clear enough for you. If not ask questions. It is really simple to make and it works surprisingly well. If I can do it, anyone can. And you can save lots of money.
Plus, it gives me the satisfaction that it is something THAT I made. I think a lot of you know what I mean.