ez up

Hey guys/gals. I need some advice. I have 2 8x8 ez-up sierra II models. I need to get the mesh sides. Can anyone recomend a source for these? Also, I see a lot of people using 10x10's at competitoins. I know I want the 10x0 models. But, is it really justifiable? Any comments on 8x8 vs 10x10 is...