The boxwave antiglare ones are very nice - I feel like it makes text input easier and readability is definitely nicer. The N800 screen isn't "sun-readable" like the N810 but if you crank up the brightness you can definitely see it in direct sunlight.

I'm surprised you found no results - search for "screen protectors" and you'll find tons. I just think they usually aren't called antireflex (rather antireflective or anti-glare) on the forums.