Dick Smith seems to be updating their email list. When you complete the form it offers you a $10 discount.
The code DS29520 isn't targeted, and is accessible by the link URL (above) without signing up.
You might find something of use in their reduced to clear or hot deals sections.
Thank you for confirming your subscription!
To say thanks, here's a $10 voucher to use any time before 13 August 2014. Simply enter the code DS29520 at checkout to redeem*.*Terms & Conditions: Valid Tuesday 5th August 2014 until 11:59PM EST Wednesday 13th August 2014 at www.dicksmith.com.au only. Offer is not available for Click & Collect orders. Excludes Dick Smith Commercial, Wholesale or International customers. Not to be used in conjunction with Woolworths Discount. Dick Smith reserves the right to withdraw this promotion at any time. Minimum transaction amount is $50 (fifty dollars). Only 1 (one) discount per transaction per customer is permitted. Excludes Calling Cards, Prepaid Recharge Vouchers, iTunes Cards, App Store Cards, Gift Cards, Xbox Live Cards and PSN Cards. Dick Smith standard terms and conditions apply.
UPDATE Despite the calling cards exclusion, frysie discovered that "You can get 3x $30 telstra sim starts for $65.30 delivered. $21.70 each with the $10 applied. comment
I received the same email and code.
It is NOT unique for each user.