There is a company called the Concept Kitchen that sells such film.
I ordered a set of 12 films awhile ago for a Zoomer, but with a pair
of scissors they can be adapted for an Ogo, or almost any other
piece of consumer electronics with a scratchable screen.
The film is held to the screen w/o adhesive; it's similar to the protective
rubbery film that watches and calculators ship with. Quite durable and
relatively inexpensive. The only gotcha is that making them stick on
non-glossy screens (like the Zoomer and some Ogos) may be a bit tricky,
but once the film takes hold, it lasts awhile...
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