Alternative cab window shades for Sprinter Class C

I love most things about our sprinter Class C but the cab window shades seem to have been an afterthought. Especially the driver and passenger shades. They have magnets that are too few and poorly placed that I end up wrestling with the shades for 10 minutes only to have them fall down a half an hour later. Is there an alternative, like a roller shade or something? Any ideas would be helpful.