Since that 50% coupon became known, I've bought 16 books at Kobo. The average price per book is €2.67.
Some books were not available at Kobo US, and Luzme.com said they were at Kobo UK. I "relocated" to the UK to purchase them. Sometimes the prices are ridiculous.
Price when "located" in the Netherlands: €7.99
Price when "located" in the UK: £3.99 (€4.75)
Price when "located" in the UK + Coupon: £1.99 (€2.45)
Price difference is 3.26x.
I already had The Belgariad and Malloreon series by David Eddings in e-book for some time (but not read yet), and now I've completed them by buying Belgarath the Sorcerer, Polgara the Sorceress, and The Rivan Codex; all for about €8.75. These are quite big books too. In paperback, Belgarath is 840 pages, Polgara comes in at 805, and The Rivan Codex, while smaller, still has 465 pages.
Back in the day, I paid €9.95 per book on paper.
Now these paper books can go make someone else happy, as I have e-books to re-read
edit: Oh, yes. HarperCollins e-books. Generic cover, and an first-line indent 30% of the width of the page. Thank god for Alf and Sigil. (Without Alf, I wouldn't even be e-reading bought books, actually.)
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I have doubted if I should replace my paper version of The Dreamers, also by Eddings, before I give them away. I didn't really like those books. It is about a foe that tries to take over a continent that is devided into lands. Each land is ruled by a young and an old god. The protagonist and his helpers basically rush around the continent, fighting a battle on each. I felt like reading the same book four times, as the tactics and strategies in each battle where exactly the same, and each young/old god goes through the same "change-over", where the other starts his ruling period, and the other goes to sleep.
It is the one series in my life I have ever seriously contemplated to quit reading halfway through the third book, so I think I'll pass on this one forever, as an e-book.