The silicone baking sheet will work as long as you tape all the edges down well. I gave up on the expensive sliders after sewing through mine more than a few times.
I found a silicone microwave oven liner - and it does have cling adhesive on the back. It is 16" square and I just cut out a 2" or so area so I can change the bobbin without taking it off.
It's made by Wilton, but I got mine at a surplus store - so I have no idea where else you'd find it. Sorry.