Over yonder! :D
Though I won’t just assume you’re from the UK and I’ll suggest you look for some local shop! These were just the cheapest ones I could find with UK shipping.
The lenses aren’t actually completely WHITE, they’re this mesh thingy, (so you can see through at least somewhat) but you can’t see it from further away, unless the person looking is going to stare into your eyes from a 5cm distance haha.
In short, scared the shit out of people at comiccon with these, so it does the trick :DD