Thanks, I appreciate the ideas, but for reasons I don't really want to get into, they have to be a 'mainstream' line (ie a brand that you'd find at a Sunglasses Hut or something similar). Persol is probably the most 'out there' brand that my friend could acquire, but I find that the 714's don't suit my face shape (it could be because of the size of the frames that I tried).
Look up Dior Entracte 2.
1. Mainstream brand obviously
2. Come in variety of colours light/dark tortoiseshell
3. You can pick them up pretty cheap too.