I got my pair from eBay for about $10. Brand new "real" ones from an army surplus or motorbike shop cost $50-$60. These are costume grade "Carting Goggles," and they are very fashionable and trendy.
They were shiny and chrome, which would be "innovatively early" for the Victorian age, but my steampunk look needed to have a little more wear-and-tear-and-grit about it. I sanded and painted the chrome with a mixture of golds, coppers, greys and blacks to give it more character.
The finished look with the helmet:
For those wondering, the little chain on my pith helmet is purely decorative, and just another greeblie I added to the costume.
Previously on Slashboing