Afro, I would have to say that there's even less of a difference between the price of a new book in ebook or paperback format. It's closer to about fifty cents.
For the Nook most of the new paperbacks are the exact same price, and the Nook versions of new hardcovers tend to be about $3-$4 less.
I was just going by my experience as a Canadian Kobo user. To use the recent Trek books as an example, the Chapters list price is CA$9.99, and the price in the Kobo store is CA$8.99.
But yes, to be fair, if you are a Chapters iRewards member and you buy the paperback at Chapters' website (5% discount), then you pay CA$9.49, and the difference is fifty cents. And if you buy the paperback in-store (10% discount), then you pay CA$8.99, and the price is the same as the eBook version.