Have you thought of getting a broken portable DVD player with a 10" screen? Some of them accept A/V in and if the DVD player portion doesn't work you can still use that. I've found that to be the best affordable choice when it comes to portable video game screens if you intend on getting a larger screen.
EDIT: It is doable on a DVD player that doesn't accept A/V in, I hacked up a 7" portable DVD player and was able to remove the bottom half, leaving wires from it for S-video (chroma and luma) and voltage.
This, for instance would be a suitable screen. If you notice the LCD screen on it looks good; it even has the original protective film. I'd guess that the DVD portion would not work. The only question would be if it accepts A/V input.
EDIT EDIT: Most DVD player screens are backlit, but without much effort you could add a manual cutoff switch so it'd work without backlight.
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