Reddit reviews Partytime Copper Moscow Mule Mug, 4"H, COPPER

http://www.amazon.com/Fred-Friends-Hopside-Down-Glass/dp/B001W35FFY

I did a google search for "Beer bottle glass" and it was one of the first hits.

Edit: It seems very hit or miss with this glass. I'm reading a lot of reviews of imperfect seals causing the water to leak into layers between the glass. I also read that its horribly delicate. To be honest, I'd recommend you guys skip buying this novelty and invest your money in something better and equally unique.. Like this: Moscow Mule Mug