Based on some recent conversations on Twitter it seems as if the coupon vouchers are somehow overlooked by most people, which is a pity since they can often make Kobo a far cheaper option than Amazon.
So here's a brief tutorial on how to use coupon codes at the Kobo store. As far as I know this process only works with purchases through desktop browsers and not the Kobo device itself. You can also find a list of active coupon codes and offers at the bottom of the page. I'll try to keep this updated as I find more coupon codes to add.
First you need to set your account to allow you to use coupons. Go to My Account > Account Settings. Under the Checkout for ebook purchases setting make sure that "Show me standard checkout" is checked. Click on "Save" and you should be all set.
Find the books you want to purchase and click on the Buy Now button which will take you to the checkout page. Look for the section titled "Redeem any gift cards or promo codes". If the book is eligible for a discount you'll see a block where you can enter a promo code (the discount coupon). If you don't see the option to enter a promo code you won't be able to use the coupon for that specific title.
Enter the coupon code in the box provided and click "Apply". The discount should now be active and you can continue with the normal checkout process.
Kobo doesn't offer a basket, so you can't buy multiple ebooks at once. Each ebook needs to be purchased seperately. This can result in lots of credit card transactions which might raise flags at your bank. An easier way is to purchase a Kobo gift voucher for yourself. This will allow you to use store credit to pay for your purchases without having to enter or store your credit card details each time.
[Update:] Seems the Kobo site doesn't allow for the sale of gift vouchers any longer.
Also note that South African users won't be able to pay via Paypal due to ZAR not being supported as a retail currency for Paypal merchants. You'll be faced with an error message each time (I learned from experience.)
Where do you get discount coupons?
Keep your eye on the newsletters from Kobo, they often contain a single use coupon offering discounts from 20%-35%. Kobo also sometimes partners with certain bargain websites to offer special coupons. A little bit of Googling will often result in a coupon you can use.
Currently active coupons:
Single use per account unless stated otherwise.
Purchase your ebooks at Kobobooks.com using these discount coupons:
20% off - Welcome20
20% off - anniversary20
20% off - save20bday
30% off - VoucherCode30
30% off - Comeback63_31
35% off - thanks5_613
Device discounts for US & Canada
Up to $70 off the Kobo Arc (Code: RFN47)
$20 off the Kobo Glo (Code: EJB29)
(Ends 15 June 11:59 EST)
Please let me know if this post has been useful and which ebooks you managed to snag with coupons.