I came across this new sunshade for the iPad mini and it looks like it will adapt to other tablets too.
Drone Aviator hood for the iPad mini - HAV1 in Aviator Hoods
It's a little pricey but Hoodman's products are very well made and they have excellent customer service.
Drone Aviator hood for the iPad mini - HAV1 in Aviator Hoods
It's a little pricey but Hoodman's products are very well made and they have excellent customer service.