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Most firms that specialise in l various plastics and cut to size, will stock Teflon or more generically PTFE. I used to go to Cut to Size Plastics in Artarmon and they would let me look through the Offcuts and cut some off for as nominal price as you don't need very much . Avoid Nylon or any other of the cheaper Teflon like plastics , they just dont work properly .
I can recommend getting the acid etched stuff which is brownish on one side so you can use epoxy to mount the stuff . If you use brads or nails or dill holes in it you often get raised rings and bumps which take a long time to wear down into proper contact . I prefer cutting the stuff with a craft knife and just epoxy it down once I have the right location .
You can also use thin double sided tape . My favorite thickness was 1/16" rather than the more common 1/8 and 1/4" . It tends to press flat better and give you good contact . From memory all the qualities of freedom from stiction and smoothness are best at a loading of about 6 or 7 kg per square inch of teflon .
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