Found this over on Reddit https://www.reddit.com/r/Vive/
Courtesy of /u/ScruffTheJanitor
Appears in conjunction with the Australian release of the HTC Vive, there is a bundle available from HTC that can be redeemed on Steam.
5 Free games on offer,
Cloudlands Mini Golf ($19.99USD - Currently on sale for $13.99)
The Gallery - Episode 1: Call of the Starseed ($19.99 USD)
Zombie Training Simulator ($19.99 USD)
A-10 VR ($4.99 USD - Currently on sale for $3.49)
Jeeboman ($9.99 USD - Currently on sale for $6.99)
You will get 4 codes in your email, the First code will give you The Gallery and Zombie Training Simulator and will be called Vive Bundle 3 when you redeem it in Steam.
The rest will give you them singly.
You now need to provide proof of purchase (Scanned copy of your receipt or electronic version) attached when claiming.
For folks who do enter their serials numbers and get the message "Already Used" you will need to chat to HTC via http://www.vive.com/anz/support/contactus/
Courtesy of shanakatak and benkus83 who are going through the process.
There is some chat in the thread on Reddit of the legitimacy of the offer, but I received the codes instantly.
People are entering fake names and numbers and receiving codes.
Not sure how long the offer will last.
*Edit - People are putting in fake Serial numbers like 1 number off from their Serial number and receiving more codes.
This is possible done through HTC or a third party by the name of Accelerate Creative Strategies.
So I cant see the codes lasting long with that revelation. Sad really, but grats on everyone that can get some
*Edit 2 - This offer might be over, will keep an eye on it before marking it as expired.
*Edit 3 - As googolplex pointed out, this has been Redditted. Marking this as expired.
*Edit 4 - Waiting on this to go live again, hoping it'll be soon. Currently displaying 'We are currently making some changes to the Vive redemption site and will have it back up again soon. Apologies for any convenience.'
Got it straight away. Thanks op