One thing these sunshades I see here do not specify is weight. Stating that it's lightweight is not enough.
Because for we larger screen users (9-10"), getting a shade that's too heavy means that it flops around too much, making it useless.
My simple sunscreen weighs only 7.8oz. I have no link, but many of us have seen the 4-sided shades (top, sides, back), made of cardboard, fastened with velcro (not magnets), white outside black inside, suction cups on the inside-back to hold the tablet. It was under $20 and works fine.
This won't last forever however, so when I go to buy a new one, I really needs to see your weight specs on your web page, because I won't buy it otherwise.
Speck