Digging up an old post upon finding it on google.
CORRECTION!!: Yes, there are reflective AND mirrored lenses on Ray Ban Wayfarers, I have a pair of B&L Wayfarer with a reflective gradient (looks mirrored in most environments) B-15 Lens. I've also seen Wayfarers with mirrored (colored and noncolored) on the vintage sunglass websites.
I prefer the B&L glasses to the newer Luxotica Ray Bans, the lens seem to be of higher quality, and they just feel more solid.
That being said, it would be much much cheaper just to buy cheap China wayfarer knockoffs with the mirrored lens, but if you want real Ray Bans with Reflective/Mirrored, you might have to go B&L new old stock. Or if you just want the Ray Ban Logo and don't care about genuineness you can get branded knockoffs on ebay.