https://collaboration.skype.com/promotion/
Just sign up for this not sure if it works for everyone. You need to submit your email and they will send you a code I think?
Many people has reported that they have received the code including myself. Just try a different email or try submitting your email again if you did not receive it. I got mine after 2 mins of resubmission.
The site is pretty slow. So need to be patient, I think it has be ozbargain.
I have successfully submitted the code and it says
You voucher or prepaid card was successfully redeemed and we are not activating the following services:
$107.88USD or 119.88 AUD Skype Premium
This beats the 50% deal at woolworths starting today.
Got this email too!