As anyone that knows me from the Zaurus forums - I'm cheap when it comes to screen protectors. Did my usual experiment with the 810 this evening.

Cut an overhead transparency to these approximate dimensions:
5.7cm X 9.5cm.
Nip the corners about a mm and work it under the lip of the screen. Instant screen protector for about .05! I think you could get about 6 or 8 out of one letter size sheet.

This will seem way too big when you first place it on the 810 but there is a large amount of space under the lip - especially on both sides. I started with just a mm or two overage and it would slide around enough that a full mm was uncovered side to side. Took another guess and cut a new one - fits well. When I get a little time I'll make a .pdf template to print them on lasers.