Found deal at OzBargain

How to claim (c&p from OzBargain):

• Click this link
• Enter your details (work or university email)
• Check e-mail and follow the link to create a Veeam account
• You should receive a Veeam confirmation e-mail
• About 10 minutes later you should receive a third e-mail with a personalised T-shirt redemption link
• Delivery is 6-8 weeks

I used my University of Waikato email address and received a registration email within 10 minutes. 'Claim T-shirt' email about an hour later. I got a medium green t-shirt. XL onwards was out of stock when I claimed the freebie.