If you are still in the market for the glare reducing sun visor attachment, I spotted the product I was originally referring to at my local Kragen auto store tonight.
It is made by Axius/Auto Expressions and was $9.99.
Here's the information from the package:
Multi Visor Glare Reducer
(Kragen UPC: 8512485)
609 Science Drive, Moorepark, CA 93021
And the website pdf:
On bottom left of last page (6/33)
Another picture can be found here:
In the picture, the black clips on the left of the tinted part are hinges that open to extend the sun coverage to the side while keeping the sun visor forward.
But, the instructions on the back of the box also say that it can also be reversed for the passenger side, so it looks like you may be able to set it up to just hinge to the side instead of opening it up and then hinging it.
Hope that helps,