What's the ballpark figure for a transitions face shield? I'd never even considered that they'd make such a thing, but can certainly imagine that it's a useful feature.
$130-160 depending on how lucky your timing is when you buy it. Which is really pretty decent when you consider at most optical shops it's usually ~120 just to get it on glasses. (I worked as an optician through college, optical markup is hiiiiigghhhh).
I tried a couple helmets with the flip down interior shades, but they don't come even close to comparing.