Originally Posted by Difflugia
Keep in mind that the Kobo coupon discounts are in addition to any discounts already on the price, but BoB coupon discounts are off the original price. For example, if a $10 book is discounted to $7.50 at each store and you then apply a 40% off coupon, at BoB, the final price is $6 (40% off $10) and you add $.80 to your rewards account (a total of %48 off using their math). At Kobo, the $7.50 price is discounted a further 40% to $4.50 for a final discount of 55%.
Except that BoB's prices includes VAT, and Kobo add VAT to their prices at checkout ( At least if you live in Europe).