This popular deal is back.
Half price Men's & Women's Ray-Ban
Starting from $102.50 for non-polarized lens
Starting from $112.50 for polarized lens, link thanks REEGZ
I don't how to refine the search link to just sale items, if anyone does please let me know and I'll update the post, thanks :)
Note: Currently, Sunglass Hut is also running a similar deal with an extra $50 for spending over $150 on polarized sunglasses. There seems to be a glitch and the code is not working at the moment (applied but not showing the discount. However, if you take a screenshot and email them, they may sort some deals out for you. Could works out to be up to 66.4% off for a pair. According to T&C, the deal is ending today, so message them quick :) (Thanks to Unorthodox for suggesting Sunglass Hut)