I just found out that there's free delivery on any Lulu items (books or calendars) ordered before 4th December, even a single book. Normally their postage can be quite high for low volume orders, so this is a good offer - you just enter the code FREESHIP at checkout.
You can get print copies of my books from Lulu.
Update - if that offer is over, here's another code you can use up until midnight on Thursday, December 5th 2013:
(30% discount, valid on up to 14 books.)