Here is the link to the actual promotion http://sellercentre.ebay.com.au/promo/2061 As mentioned, it is strictly invitation only. No amount of links posted is going to get it to work if you didn't get the email. These are different to the regular free listing promotions that everyone can take advantage of.

Cut and paste from the promotion page:

Who is eligible for this promotion?

• You must accept the offer and the terms and conditions and receive confirmation from eBay that 'you've accepted the offer' to be eligible for this promotion.
• This Promotion is open only to members validly registered on eBay.com.au who have received the email invitation to participate. This invitation is not transferable or exchangeable.
• The Promotion is linked to the USER ID to which the invitation is sent by eBay.  Qualifying Sellers must list using the USER ID at the top of the invitation.
• Members whose eBay accounts are temporarily or indefinitely suspended or made inactive prior to or during the Promotion Period, are not eligible for this Promotion.
• For listing in 2 categories, standard rates may be charged for the second category.
• Sellers with listing restrictions will still be restricted by their listing restrictions and will not be able to participate.