Got an email from Clearly Contacts saying..
Dear <my name>,
We hope you enjoyed experiencing how easy it is to order glasses online from us with our Free Glasses promotion. With prices well below traditional retail, Clearly Contacts makes eyeglasses affordable enough to own multiple pairs. Stay fresh with different styles for different looks.
For a limited time, ClearlyContacts.com.au is extending to you this exclusive offer: to help get you started on your very own glasses collection, take 30% Off and get free shipping! Simply use coupon code VIPOFFER at checkout.
Don't delay, this offer is only valid until November 7th!
** I presume the code is reusable as it seems just generic.