In regards to the 90% Kobo coupon, please be careful. I got one from Amazon, supposedly. The English used is poor and although it says it's from Amazon, further checking the email used shows it is from
service@coupon.com
Here is the message of the email:
This is a random selection from Amazon.com on the occasion of our 20th birthday
we selected more than one million customers in first step then we have chosen just ten thousand other customers also randomly to be winner of discount coupon for 90%.
This coupon is valid for all amazon product take it in the link below.