Ian not sure where you can find it, but there's this great app called The Hunt, where you just upload a picture of what your looking for, you can set how pricey you want it to be and people will help you "hunt" for that item or items similar. You can also "hunt" for other people. It's kinda like Pinterest, but for clothes. I think it's a website, and its available in the App Store. I think it might just be for Iphone and iPod touches though.
They look a little like a "John Lennon" style of glasses. I saw a similar style at Macy's in a tortoise shell finish. A little pricey, but maybe it will get you on the right track to find what you're looking for style-wise.
