Free shipping this weekend + 9th Birthday clearance sale worth a look at Booktopia.
The shipping cost on your Booktopia order would have been $6.50. Looking in the clearance bin in the $5 to $10 price range there's plenty of books around this price - so you could take the offer as 'add an extra book' to your order.
While not as cheap as ebooks, the paper form still has its place. In the $5-$10 clearance section there's quite a few cookery books. As a kindle owner there's certain books I still tend to want to have in paper form. Cookery books are one.
Anyway - worth a look if your wanting to stock up the library.