Make your own. Transparency sheet with corners cut rounded, foam strip cut from a sponge stuck along one edge of the sheet with double sided tape, elastic strap

Make your own. Transparency sheet with corners cut rounded, foam strip cut from a sponge stuck along one edge of the sheet with double sided tape, elastic strap stapled to two corners. Easy and effective. We have been making and donating them to hopsitals and first responders in our area (not in the US) who are happy to get them.