Another way to make your own sanding sticks.
Select a wet/dry sandpaper, or any other paper/cloth backed
Get a box of popsicle sticks at the craft store (they call 'em
Place a sheet of sandpaper face down & coat the back with glue
(any carpenter's type glue will work), don't overdo the glue.
Cover the glue with the sticks. You can put about 50 sticks on a
(9x11 inch, US) sheet of sandpaper.
Cover another sheet of sandpaper with a thin coat of glue &
place it over the sticks. If you only want 1 sided sticks omit
the second sheet.
Set the assembly aside to dry, (depends on the glue & humidity)
Cut the sticks & sandpaper apart with a razor blade or knife.
Making your own lets you tailor the grits to your own