Clearly contacts currently have 30% off sunglasses frames, lenses and coatings.
I just picked up some Ray-Ban Wayfarers with prescription lenses and UV coating for $149. With health fund rebate they were free :)
Polarised lenses are an extra ~$35.
Lots of styles and lens options! Not sure when the code expires.
Couldn't get that code to work for me, sadly. Their 25% off code worked though.