Begin with going to this site
PHP Code:
https://gcp-coupon-redemption.appspot.com/redeemCoupon
Fill in the form and use one of these codes:
Code:
PHP Code:
SystemsUp
Paradigma
Avere
MiTAC
PuppetLabs
NOW
image:
PHP Code:
http://i.imgur.com/kk2uv9F.png
image 2 :
PHP Code:
http://i.imgur.com/jyC3lZM.png
Enjoy!