From their website:
Step 1: Purchase an ECLIPSE Mints tin from a participating store in Australia during the Promotional Period (05/09/2011 – 30/10/2011).
Step 2: Complete the details below before 30/10/2011 and click SUBMIT to validate your claim.
Step 3: Using your credit card details, make the payment of $18 for one general admission movie ticket for the participating cinema of your choice.
Step 4: Your movie voucher will then be emailed / mailed out to you for you to claim two movie tickets at the ticket booth of your chosen cinema.
Participating Cinemas: http://eclipsemintsoffer.com.au/site/images/ParticipatingCin…
Terms and conditions: http://eclipsemintsoffer.com.au/terms-conditions
FAQs: http://eclipsemintsoffer.com.au/faqs
Worth noting:
Every valid claim received (including payment) will be issued with a two (2) for one (1) movie voucher. All vouchers are valid for 6 months after payment date. Cinemas will only issue a movie admission ticket on presentation of a voucher. No exceptions apply. Vouchers can be redeemed over the counter at any Event, Greater Union, Birch Carroll & Coyle and Village cinema nationally for up to two (2) GA adult movie tickets to see any film Monday to Thursday (excluding school and public holidays, special events, movie marathons, 3D movies, Vmax and Gold Class). Claimants must redeem the two (2) tickets at the same time for the same movie at the box office. For the avoidance of doubt, Claimants can use their voucher for two (2) GA adult movie tickets or:
One (1) GA adult movie ticket and one (1) GA child or concession movie ticket; OR
Two (2) GA adult, child or concession movie tickets.
So how much is a tin of Eclipse mints? That would have to be added to the $18 for the total cost. Other things to note are that it's valid Mon-Thu only and that two people have go to the same film at the same session.