Here's a multi-use code giving you 90% off eBooks. Great for those who have recently picked up a new Kobo eReader, although you can also read them on iPad, Android, PC etc. Usually codes are around 50-75% and I've never seen anything more than a 90%, so this is definitely a good deal!
As always there are some books which don't work, but many do. You can also use the filters to only show books which accept a promo code.
Not sure how long this will last so best to get your purchases in while you can. Enjoy!