The following 7 books by Michael Rank are on sale for A$1.05 each at the Kobo store.
If you use the single use code kobosta1406 you get A$1.00 off and pay only 5 cents for one book.
To purchase another book for 52 cents, use the single use code SAV50.
You can also try the codes listed on http://www.mobileread.com/forums/showthread.php?t=115233 for discounts on further purchases.
For example, use the multiuse code PERKOPOLIS and get 40% off.
History's Most Insane Rulers
History's Greatest Generals
Greek Gods and Goddesses Gone Wild
Lost Civilizations: 10 Societies that Vanished Without a Trace
History's Worst Dictators
The Crusades and the Soldiers of the Cross
From Muhammed to Burj Khalifa: A Crash Course in 2,000 Years of Middle East History
is that in USD or AUD ???