Thanks to @clayD ,Clay Douglass, for building this awesome jig. It allows you to cut your own paper for the Supermax sander. You’ll need a heavy duty utility knife (not one of the tiny snap blade ones). Side the paper in, then there is a slot for the knife to cut. Flip the paper around and repeat.
A box of 3 pre-cut rolls is around $35, at Woodcraft.
A 75 foot roll of paper is $40, from Maverick, plus shipping. Call it $45. (You can find cheaper imported paper, but make sure to compare roll length).
You get 6 strips from that 75 foot roll.
So about $12 per strip, vs $8.