Mirror attached to inside of windshield?

[9GaugeReaper]

I see these rounded mirrors attached to the inside of the windshield. For the most part, it has only been the UK vloggers that I see them. I'm guessing they work a lot better than the stock mirrors? Any idea where I can get one here in the states?

 

[TriumfAnt]

If you contact the site they'll let you know how much it will cost. Here's the link;

http://www.huntercreate.com/contact.htm