Select the M plan and apply the promo code S7EM to receive the discount
Late special: $59 3GB plan on S7 Edge. $21 per month discount.
Please note your upfront payment will be $80 and the first discount will appear as a credit on your first bill.
Previous deal post with relevant discussion
EDIT
Hi all - just to clarify for everyone. These 2 codes are valid. They were set up to assist people who had issues ordering during the sale last week. The fact they've been posted online is not a problem - we're not going to deny anyone the sale price if they use either of the codes.
Please note - during the checkout process it will still show the full cost, however on Monday 22/8, the handset price will be changed to the lower sale price for anyone who has placed an order and used either of the codes - ie, to $9 on the M plan and $5 on the L plan. You will then be sent an SMS to confirm the monthly handset price has been changed.
The recent deal for the S7EL code for banned for sockpuppeting.
Looks like a generic code throughout.