gettingtoknowu23
If you complete the survey for kobo, you'll get the discount code gettingtoknowu23. Looks common code to me..
You can apply this on checkout but only on a selected list of ebook, however, I don't seems to find the list.
To validate, upon checkout under "REDEEM ANY GIFT CARDS", you will either see
Have a gift card or promo code? Use it here(click open the redeem code and you can apply the code)
or
Have a gift card? Use it here(which means you cannot redeem the code)
Enjoy!
EDIT : Apparently, if you complete the survey, you will get a special on your Birthday too..