Hi
I no that this is an old thread but i read it the other day when I was looking for the same.
I have since discovered that Apple iBooks have just released the full Merlin series (including the 4th book) for $9.99 AUD called "Legacy".
I use it on my iPad don't no if u can use it on any other forum.
I was very happy with it maybe others might be as well now .
take care
chewy