I was already looking for bargains and special offers on paper books before I got my ereader.
I'm not sure I have ever paid full price for a hardback book. I always thought they were a dumb idea, given how much extra space they took up and extra money they cost for the same words. I still ended up with quite a few from promotional offers and remainders.
I'm no different with ebooks. I don't know if I spend any less, but I now have more unread books than I've ever had.