Just found these free ebooks while browsing from the site:
MS Office 365
Introducing Windows Server 2012
Introducing SQL Server 2012
Publsihing with iBooks Author
Open Source Strategies for the Enterprise
The rules of chess
Pushing the limits
The lavender keeper
Fast Forward
The Infects
Slow Ride
Europe
Chance
Under the Olive tree
No Escape
The Other Sides
The Prince
Come August, Come Freedom
Recession Busting Britain
Culture Vulture Britain
Tasty Britain
The Philippines
There are more free ebooks not listed on the link, just search for any keyword and sort by price (low-high).
I don't think any of those have been reduced. They're free because nobody would pay for them…