They are available from the New Zealand Doctor Who Fan Club
The books are as follows;
- Doctor Who and the Pirate Planet
- Doctor Who and the City of Death
- Doctor Who and Shada
- Doctor Who: Resurrection of the Daleks
- Doctor Who: Revelation of the Daleks
While on the Site, you might also want to check out their fanzines and the fan story Glory of the Daleks.
In my opinion though, the best book on the entire site is;
Doctor Who - Who Killed Kennedy by by David Bishop & James Stevens
This book is sadly out of print but you can still download the PDF on this site if you want to read it.