The ones I am wearing are the rayban mirrored blue and Stephanie is wearing the red mirrored. They are called the Flash lenses to be specific and you can grab them here : grab them here! They retail for $160.
However, there are a bunch of knock offs and to be honest, I love a good pair of cheap-o sunglasses...for a few reasons. One being, I lose my sunglasses like it is my job. The second, I like to wear a different pair every day almost, and if I spent upwards of $150 each time on a designer pair... well you do the math That would be a lot.
I found a few very cute alternatives for you.
These are by Cheap Monday for ASOS. Love the flash color here. Very hippie-chic and for $59 great price for quality. http://bit.ly/15wAkwp
Another favorite pair are these that I wear winter and summer. Another aviator style. Can you tell, I love aviators. These are polarized dark grey Raybans as well, can be found here http://bit.ly/16FmxZ7
Looking for the cheaper alternative? Love these! May just order these myself right now, available here http://bit.ly/14cxXjf and they are $28, major win!
Looking for an even cheaper alternative? Try your local H&M, I always scored amazing sunglasses there. Also, if you are from NYC, look at the street vendors, I know, usually I don't like street vendors but the sunglasses are a NYC best kept secret.