hi...I bought a sheet of really cheap non stick oven liner...again mine is quite thin and very flexible. I cut a tiny hole for the needle and I tape it to my extension table...it works brilliantly.
A few weeks ago I bought a Super Slider thinking it would be better....have used it a couple of times and have put it away....I much prefer my non stick oven liner...much bigger and the fabric moves much easier on it. I would try and get the beige colour over the black as much kinder on the eyes.
Here in the UK most kitchen shops and garden centres sell it...Good luck with finding it.