Thanks to tips right here on GJ, I also used yoga mat. Other tightwads recommended kitchen drawer liner, which is definitely non-slip and cheap, but I didn’t like the looks of it having perforation holes that would let dirt fall through.
(Looking back, I don’t know why I care if dirt fell through. It has to get cleaned up one way or another someday, and holes that let it pass through make that a faraway someday.)
I really wanted red for my drawer liner, because my used Craigslist Sears box was navy blue, not the red my traditionalist **** yearned for. There are many, many color choices in yoga mat land, but to get the red I wanted was going to be $10/roll plus UPS on several rolls, and it started to look no cheaper than Sears CMan or Kobalt drawer liner material.
I wound up finding 5 rolls of orange stuff at Wal-Mart being blown out at $5/roll. Wasn’t so keen on orange at first, but it has grown on me – good contrast in dim lighting! (The fruity lime green polka dots, mercifully, are only printed on one side. The bottom side, in this application.)
It is pretty decent with the nonslip grip.