$100 Myer Gift Card (valid at Coles, Myer, Target, Liquorland, Kmart, Officeworks, Vintage Cellars and 1st Choice Liquor Superstore) with purchase of prescription glasses.
I also ordered sunglasses at the same time and received 50% off.
If you have private health insurance and haven't claimed glasses this year - get in quick!
FYI, most optometrists have $100 off promos or better (or are capable of doing so if you simply ask).
If you were going down the no-gap route anyway and L&P can do a "full-priced" pair within your health fund limit then the deal is great!