HarperCollins released these as ebooks in the UK and Commonwealth last year, I just noticed them now:
Neverness (1988)
A Requiem for Homo Sapiens:
1.
The Broken God (1992)
2.
The Wild (1995)
3.
War in Heaven (1998)
Ea Cycle:
1.
The Lightstone (vol. 1): The Ninth Kingdom (2001)
1.
The Lightstone (vol. 2): The Silver Sword (2002)
2.
Lord of Lies (2003)
3.
Black Jade (2005)
4.
The Diamond Warriors (2007)