I will say US$10 for a new release inclusive of tax if any. As for books tat are a year old or more not more than US$7. But then again i will pay abit more if it's a book i really want,some really old books tat i would keep and read over. I just stop buying tis few days coz of the price increase and just add books i wanted to my wishlist. If this trend persist, i will most likely turn to the 'ahem net'