I recently ordered a None Felt turntable mat from Extremephono. This was to replace the felt mat that was supplied with the MMF-5.
I am quite happy with the results and the cost, in terms of the audio world, was a reasonable $32.00.
That said, I was browsing the tool section at Lowes home improvement center today and happend to notice a roll of "KOBALT" brand toolbox tray liner. This appears to be the same material the None Felt mat is made from. It may not be the same, but it looks and feels identical and I strongly suspect it's the same stuff. The price? $14.95 for a roll 22" wide and 118" long. Enough to cut out a nice dozen platter mats if you liked.
mike