I just found this on AliExpress:
€9.59 | 0.2-30mm Multiple Size White PTFE Board PTFE Sheet Plate Block Polytef Plate Anti-Corrosion Machining Model Processing Materials
https://a.aliexpress.com/_c3YUbnKZ

ΰϊδ φψικ μητω μεη ptfe. θτμεο ζδ ων ξρηψι

ΰρσ.