Is there an inexpensive screen protector I can use for my display?

Check out screen protector vendors below. The size you need will depend on your bezel design and visible display area.

Photodon

Find Universal Stock sizes. Photodon can also trim down films to your dimensions for a custom fit. See a description of all film types: clear, anti-glare, and specialty.

NuShield

For the SLCD43 module, check out Part Number NU300E, Select DayVue film. Read more about DayVue antireflective film for electronic displays.

ARMR-200

This product by 3M is another option. It is an anti-reflective, matte, 5mil protector. Digi-Key sells sheets of it, and then you need to employ a die cut company to slice it to the right size. In a typical application, cut it to the visible screen size so you can replace it easily. If you are trying to seal the screen, cut it to the size of the display and mount it behind a gasket.