Technically, you could send books for $6.50 - you need to have the B1 box that some kind person has sent you on a previous buy then use click and send for $6.50, about 3 small hardcovers will fit in a box and the only limit is 15 kg. It doesn't happen often 🙂

Totally agree. I found about the AP boxes with C&S recently, and have been able to reduce all of my postage costs.

So far the best i've been able to do is 9.3kg in a B1 box. And at $6.50, that's a bargain. Plus $1 more for sig 🙂